Standardized subjects include requirements for paints, standards for evaluating the qualifications of contractors, surface preparation standards, and other topics. Here is a list and brief summary of the surface preparation standards used in the hot-dip galvanizing industry with a brief summary of each.
The method of solvent cleaning is intended to remove all visible oil, grease, soil, drawing and cutting compounds, and all other soluble contaminants from steel surfaces.
The specification calls for the removal of dust before solvent cleaning by the use of a stiff bristle brush. After solvent cleaning, dust is to be removed by either blowing off with clean dry air or vacuum cleaning. The specification lists several different ways in which solvent cleaner may be applied to the surface including wiping or scrubbing the surface with solvent, spraying solvent directly onto the surface, vapor degreasing, immersion, alkaline cleaners, and steam cleaning.
This standard covers the removal of loose mill scale, loose rust, loose paint, and other loose detrimental foreign matter from surfaces with the use of non-powered hand tools. Adherent products as determined by a dull putty knife are not to be removed with this procedure. SSPC-SP1 removes oil and grease before cleaning with hand tools, and compressed air or a vacuum will remove dust after this cleaning procedure is completed.
Removing all weld slag and stratified rust with impact tools, using non-impact methods such as scraping to remove all non-adherent materials, and feathering an adherent paint coating, are all hand tool cleaning methods accepted by this standard. The specifications for preparing hot-dip galvanized steel for paint and powder coating ASTM D and D respectively list hand tool cleaning as an acceptable method for smoothing the surface and removing zinc high spots of newly galvanized and partially weathered coatings.
Hand tool cleaning also acceptably cleans a hot-dip galvanized surface before surface profiling according to D The standard includes using rotary, impact, or power brushing tools to remove stratified rust, weld slag, and mill scale. Power abrading tools also acceptably remove mill scale according to the standard.
SSPC-SP3 requires power tools to be used in a manner that prevents the formation of burrs, sharp ridges, and sharp cuts. Feathering the edges of adhered paint surfaces is also required.Win a free iphone
In preparation for paint and powder coating, both standards are mentioned by D and D in the same section. They are considered interchangeable in their use of smoothing the coating and removing zinc high spots before the zinc coating is further prepared. D also considers the two methods interchangeable during the surface cleaning phase of the process.
A, however, does not specifically call out SSPC-SP3 for the preparation of a damaged coating for repair by zinc rich paints. A white metal blast will remove all coatings, mill scale, rust, oxides, corrosion products, and all other foreign products from a steel surface.Painting car - Good technique Masking spot for blending paint / Waterborne Clear coat Lechler mc405
SSPC-SP5 provides conditions for the end condition of a white metal blast, and the materials and procedure necessary for providing the end condition. The standard lists dry abrasive blasting as the preferred method with wet blasting an option to be agreed upon between the two parties. The size and type of abrasive media to be used depends on the profile specified by the coating system to be used.
The standard then requires oil, grease, and dust to be removed from the surface and the work inspected. However, A uses the white metal blast as the surface preparation standard for repairing a zinc coating using sprayed zinc. This standard states a brush of blast clean will allow as much of an existing adherent coating to remain as possible and to roughen its surface prior to coating application.
This blasting method cleans less aggressively than an industrial blast clean. A provided definition of a brush-off blast cleaned surface describes a surface free of all visible oil, grease, dirt, dust, loose mill scale, loose rust, and loose coating when viewed without magnification. The surface may still include profiled and tightly adherent mill scale, rust, and coating.
Hot-dip galvanized coatings contain a layer of zinc oxide and zinc hydroxide which would be detrimental to the adherence of a topcoat. A paint coating also requires a profile typically not found on the relatively smooth surface of a hot-dip galvanized coating.
D lists sweep blasting as an acceptable surface preparation method with its own given requirements for the procedure but calls out SSPC-SP7 for more procedure specifications. Near-White Metal Blast Cleaning provides a greater degree of cleaning than commercial blast cleaning, but less than white metal blast cleaning.
The SSPC-SP10s definition of a near-white metal blast clean requires the surface to be free of all visible oil, grease, dust, dirt, mill scale, rust, coating, oxides, corrosion products, and other foreign matter when viewed without magnification.
The standard also provides requirements for random staining on the surface which shall not exceed five percent of each unit area of surface.
The surface shall be cleaned of oil, grease, and dust after the near-white metal blasting procedure.Elzly engineers perform investigations of specific corrosion control technologies, life-cycle analyses of various corrosion control alternatives, and development of engineering-based recommendations for our clients. Elzly engineers review and comment on corrosion control designs including the use of protective coatings, inhibitors, cathodic protection or corrosion resistant materials. Elzly engineers and consultants perform failure analysis and provide expert assistance with mediation and legal activities.
Elzly develops detailed engineering specifications and work procedures to ensure that the proper materials are installed correctly to achieve the performance objectives in the most cost-effective manner.
When considering a new technology for use in a specific circumstance, it is often prudent to conduct a demonstration or prototype to determine what obstacles might be encountered. We combine basic science with practical engineering knowledge to fully investigate issues and develop tailored solutions that provide optimum performance while minimizing life-cycle costs. The core of our business is related to corrosion.Bdo horse taming keeps failing
While the term is most commonly associated with metals corrosion has been defined as the deterioration of a material or its properties due to a reaction of that material with its chemical environment. Corrosion is the result of natural processes that seek to return materials to their original state, such as minerals or elemental carbon. Nearly any material, if exposed to the elements long enough, will corrode. This estimate does not include indirect costs such as those resulting from inconvenience to the user after a corrosion failure.
Clearly the impacts of corrosion on society are significant. Elzly provides expertise in a variety of technology areas including protective coatings and linings, cathodic protection and materials selection. The following paragraphs provide an overview of the technology areas in which we work.
Learn More. Elzly Technology Corporation provides technical consulting services to customers needing specialized knowledge and experience in technologies relating to protective coatings and corrosion control. We use our background and rigorous analyses to provide customers with tools and advice they require. Culturally, we recognize that our advice has an impact beyond the immediate task at hand. Strategically, we attempt to consider all issues and bring the most effective solutions to our customers.
LEAD PAINT REMOVAL (C3)
Latest Elzly News.C3 contains specific discussions on protecting workers, compliance with environmental regulations, proper management of waste streams, operations that result in potential exposures to lead and other hazards, and associated control technology. It includes background information on the hazards of lead and other toxic metals as well as a review of the current legal and regulatory issues.
The course also addresses developing programs to effectively control risks to workers, the public, and the environment. National City, CA Warren, MI Daytona Beach, FL Lead removal is a danger to the public, workers, and the environment, and there are several legal and liability aspects to removing it.
Our Lead and Hazardous Coating Removal course is essential to anyone who will be safely removing lead or other toxic metals on the job. More Information. For more information on how to take advantage of attending a course for free, click the icon to the left.
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To receive a proposal for scheduling at your facility, including price estimate, set-up requirements, and an equipment list; click the icon to the left. Click the icon to the left for more information.Before describing the difference between inorganic zinc-rich coatings and organic zinc-rich coatings, an explanation of galvanic protection is necessary.
Zinc-rich coatings are used to protect steel substrates from corroding by employing some barrier protection but primarily sacrificial or cathodic protection. A corrosion cell contains four elements oxygen is assumed to be present : anode, cathode, metallic pathway, and electrolyte.
The anode is the part of the metal that corrodes or dissolves. As the anode dissolves, positively charged ions are released through the electrolyte typically an aqueous solution that may or may not contain ionic contamination such as salts and absorbed by the more noble region, also known as the cathode.
Every metal has a corrosion potential; some corrode more easily than others. When these metals are placed in a list from most active to least active, this is known as a galvanic series. There are other metals that are anodic to steel aside from zinc, however their corrosion product encapsulates the steel, which reduces their sacrificial potential, relative to the steel.
This makes zinc the ideal candidate for creating an optimal protective primer. There are three versions of Type I, based on the vehicle type, including Type 1A inorganic post-cured ; Type 1B inorganic self-curing — water reducible and Type 1C inorganic self-curing — solvent reducible. It also lists three dust class levels, which is related to the amount of zinc in the dry film.
The type of zinc-rich coating is defined by the binder that is used during the formulation and manufacturing of the coating. Inorganic zinc-rich coatings generally consist of a silicate binder whereas organic zinc-rich coatings can use a wide array of binders including epoxy, polyurethane, and alkyd, etc. Because of the differences in the binders, the performance of inorganic zinc-rich primers versus organic zinc-rich primers varies. Inorganic zinc-rich primers generally provide better galvanic protection than organic zinc-rich primers, due to the silicate binder reacting with the zinc particles as opposed to encapsulating the zinc particles, as is the case with organic zinc-rich coatings.
Because of this reaction, inorganic coatings can be formulated with a higher volume of zinc. A higher concentration of zinc in the dried film will inevitably provide a longer life expectancy of the coating system.
This is not to say that an inorganic zinc-rich coating can be applied to any surface and be expected to last. Organic zinc-rich primers are easier to apply and are not as susceptible to dry spray or mudcracking.
Inorganic zinc-rich primers are most commonly applied in the shop they can be applied in the field by skilled applicators and organic zinc-rich primers are most commonly applied in the field. However, many agencies are switching to all organic zinc-rich systems due to the challenges associated with application of the inorganic formulations. Topcoating of inorganic zinc-rich primers can be challenging, since they require moisture to cure and are porous. Applying a topcoat to a dry but uncured inorganic zinc primer can result in a cohesive split of the zinc primer, caused by the contractive curing stresses created by the topcoat.
Since inorganic zincs are porous, they outgas when topcoated, so the application of a thin mist coat is often required to seal the surface. Organic zinc primers are substantially less porous, since the binder epoxy, urethane, etc.
Inorganic zinc-rich primers are typically repaired using organic zinc-rich primers, since the inorganic versions do not have strong adhesive binders and typically do not adhere well to one another once cured. She can be reached at kstanczyk kta.
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Marine, coastal, neutral industrial environment one coat 75 microns DFT can stand alone protect steel for years together. Organic Zinc rich primer is not a substitute of Inorganic Zinc but a supplement to Inorganic zinc and is used where precise surface preparation and spray application required for Inorganic Zinc cannot be organized. Organic zinc rich primers have been used successfully for at least two decades in the USA as part of standardized AWWA steel tank and steel pipe coating systems with no known issues.
These are typically just primers, and they are not intended to be used as a stand-alone coating system. I am not familiar with inorganic zinc rich primers being used as a stand alone system, but their usage as such may pre-date my personal experience. To my knowledge, if the stainless steel has been suitably cleaned and roughened, an inorganic silicate zinc rich primer should provide suitable adhesion, and will be anodic to the SS.
However, I have never seen such an application or use of a silicate ZR in such an application. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. All KTA services, laboratories, and equipment sales are operational while we take additional measures to protect the health and safety of our employees during the ongoing COVID outbreak.Search Close.
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Inorganic Zinc-Rich Primers vs. Organic Zinc-Rich Primers: What’s the Difference?
Region of Durham. Ontario Statutes, Regulations, etc. American Society for Testing and Materials. Canadian Standards Association. Other Standards. American Concrete Institute. American National Standards. American Society of Mechanical Engineers. American Water Works Association. Canadian Council of Independent Laboratories.
Canadian General Standards Board. Canadian Acts and Regulations. Factory Mutual. Goods and Services Identification Number. International Concrete Repair Institute. Institute of Electrical and Electronics Engineers. International Organization for Standardization. International Slurry Surfacing Association.
Manufacturers Standard Society. National Council Highway Research Program. National Master Specification. Standards of accredited organizations or other agencies. Strategic Highway Research Program.
Society for Protective Coatings. SSPC-Paint Transportation Association of Canada. Underwriters Laboratory Inc. Underwriters' Laboratories of Canada.While the major pigment component in this coating is zinc dust, the vehicle may be inorganic Type I or organic Type II.
For example, it is not a straight performance specification, nor does it pertain to extended zinc-rich coatings, nor to weldable pre-fabrication zinc-rich primers, which are applied at low thicknesses approximately one mil [25 micrometers] or less. Further information regarding these and other zinc-rich coatings can be found in SSPC. PS Guide They may be used in Environmental Zones 2B frequently wet by salt water2D salt water immersion3A chemical, acidicand 3C chemical, alkaline with proper topcoating.
These coatings cure by crystallization after evaporation of water from the coating. These systems are dependent upon moisture in the atmosphere to complete hydrolysis, forming the polysilicate.
The organic vehicles covered by this specification may be chemically cured or may dry by solvent evaporation. Under certain conditions heat may be used to facilitate or accelerate hardening.
Reference Standards. TABLE 1. D It is recognized that zinc- rich primers containing extenders, although having less total zinc dust than specified, may be able to pass all other requirements of this specification.
However, these compositional requirements are necessary, as certain non-zinc containing coatings may also be able to pass all other requirements of this specification. If there is a conflict between the requirements of.
Test Method for Pigment Content of Sol. Test Methods for Measuring Adhesion by. Tape Test. Shop, Field, and Maintenance Painting of Steel. A Guide to Safety in Paint Appli- cation.Please click the title of each standard below to see the details and descriptions of the standards.
It establishes classification categories for the quantity of pinholes that appear in a defined area of applied coating and provides a procedure for defining the areas of applied coating that will be inspected. Evaluation of the coating is performed with the unaided eye at a distance of approximately 30 cm 12 inches from the coated surface. In this standard, no distinction is made between pinholes that expose an underlying coating layer and those that extend to the substrate, but the user is cautioned that procurement documents may have much more stringent acceptance criteria in some service environments.
Stakeholders Value Statement how the standard can be used : The standard can be also used by coatings manufacturers and testing laboratories to evaluate coating formulations and applied coatings.
It is not intended to be used on steel or metal substrates, nor is it intended for use with coatings that are aggregate-filled, stipple-finished, or intentionally porous.
The standards include requirements for removal of unsound surface deposits, efflorescence, and laitance as well as other visible surface contaminants; the degree to which existing coating must be removed; and the degree to which surface air voids must be opened. Cleanliness of the surface is evaluated visually prior to coating application.
As with the blast cleaning standards for steel substrates, the standards also contain requirements for materials and methods used in the cleaning process. Stakeholders Value Statement how the standard can be used : These standards assist owners and specifiers who develop project requirements that involve blast cleaning of concrete to a standard defined level of cleanliness. They provide contractors and inspectors with benchmarks and acceptance criteria for each of three specified levels of cleanliness.
Stakeholders Value Statement how the standard can be used : The guide is intended to assist industrial coating and lining contractors developing corporate safety programs.
It focuses on the needs of painting contractors operating within the U. Core elements of a corporate safety program are discussed, and a summary of the most frequently referenced U.
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The water required for immersion testing has been changed from deionized water to potable water. The table summarizing performance requirements has been divided into two tables, one for physical test requirements, the other for accelerated laboratory test requirements.
In addition, the description of Type I formulations no longer implies that Type I coatings can be used in continuous immersion. Coatings classified as Type II must meet fresh water immersion testing requirements and can be used in fresh water continuous immersion service. Other changes are considered editorial. Stakeholders Value Statement how the standard can be used : This standard contains minimum laboratory performance properties for SSPC-Paint 40, a moisture-curing primer containing zinc as a corrosion inhibitive pigment.
The standard can be used by coating manufacturers to benchmark performance properties for their products, and by specifiers to set qualification criteria. Coatings meeting requirements of Paint 40 are suitable for use under compatible intermediate and topcoats often other polyurethane coatings and can cure in the presence of moisture.
The required amount of humidity necessary for proper cure varies with the formulation, so this is not addressed in the standard. Access to standards is free to SSPC members.Setup kibana with elasticsearch
Questions about this revision, as well as any others regarding SSPC standards development and technical committees, can be directed to Aimee Beggs at beggs sspc. Back to News.
All performance requirements, including requirements for accelerated laboratory weathering and physical tests of applied films, have been removed. The revision retains the Types organic and inorganic and the Zinc Dust Level Classifications based on amount of zinc dust by weight present in the dry film, but requires the zinc dust to meet ASTM D Type II requirement for maximum lead content of 0.
The version permitted use of Type I zinc with unrestricted lead content. The list of referenced standards has been updated.
References to the Fed-Std have been removed. A note has been added explaining that the ASTM D standard for determining metallic zinc content of a pigment will result in a significantly lower percentage of metallic zinc than the percentage obtained by using the procedure used in D
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