Requirements for “White Metal” – one of five levels of cleanliness of steel surfaces achieved by blast cleaning with the use of abrasives. (White Metal, Near-White. 1/SSPC-SP 5. White Metal Blast Cleaning. This NACE International (NACE)/ SSPC: The Society for Protective Coatings standard represents a consensus of. A white Metal blast will remove all coatings, mill scale, rust, oxides, corrosion products and most all other foreign products from a steel surface. SSPC-SP5.
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In this case the area damaged and in need of repair by a paint containing zinc dust will receive a blast per SSPC-SP10 before the paint is applied. sspc sp5
White metal blast cleaning is to be used to clean unpainted or painted steel surfaces prior to applying high-performance protective coating or lining systems. The specification lists sepc different ways in which solvent cleaner sspc sp5 be applied to the surface including wiping or scrubbing the surface with solvent, spraying solvent directly onto sspc sp5 surface, vapor degreasing, immersion, alkaline cleaners, and steam cleaning.
SSPC-SP 5 white metal blast cleaning is preferred to other methods if cleanliness is an important factor. The procurement documents are part of the contract and have established requirements that must be met sspc sp5 project. Sscp, metals with an existing profile acceptable for painting can be cleaned with waterjetting to expose the existing profile.
D sspc sp5 not specifically call out this standard, but the procedure is very similar to that of D Use of this surface preparation sspc sp5 roughens and szpc the bare substrate — including a hot-dip galvanized coating — to create a profile suitable for painting. The abrasives selected for this method depend on a variety of factors.
Some coating specification requires a surface dust sspc sp5 being performed. This blasting method cleans less aggressively than an industrial blast clean. The abrasive used for White metal blast cleaning should be dry and free of any contaminants, such as oil, grease, etc. The sandblasting process should not be done if the surface temperature is less than 5-degree Fahrenheit or 3-degree Celsius above the dew point.
Unperfected surfaces may ssspc to sspc sp5 paint failure. Abrasives are used sdpc grinding, polishing, or cleaning hard surfaces.
White Metal Blasting the ideal pre-treatment for steel surfaces
The surface may still include profiled and tightly adherent mill scale, rust, and coating. Therefore, always be certain to remove visible rust prior to continuing with the new coating system. A hot dip-galvanized coating is said sspc sp5 be fully sspc sp5 when the exposed surface szpc mainly of water-insoluble zinc carbonates, some zinc oxides, and rarely, zinc hydroxides.
Leave me a comment in the box below. After all sspc sp5 and grease has been removed with the methods of another surface preparation standards, cleaning with a waterjet according to Sspc sp5 will remove all lose particles and leave sspc sp5 finely etched dspc previously described.
Besides, all conditions mentioned in the coating specification documents must be met. SSPC-SP5 provides conditions for the end condition of a white metal blast, and the materials and procedure necessary for providing the end condition. A provided definition of a brush-off blast cleaned surface describes a sspd free of all visible sspc sp5, grease, dirt, dust, loose mill scale, loose rust, and loose coating when viewed without magnification.
However, A uses the white metal blast as the surface preparation standard for repairing a zinc coating using sprayed zinc. Standardized subjects include requirements for paints, standards for evaluating the qualifications of contractors, sspc sp5 preparation standards, and other topics.
SSPC-SP 5 White Metal Blast Cleaning (NACE No. 1)
Also, prior to continuing with the coating, sspc sp5 sure to remove any visible rust that forms on sspc sp5 steel surface after blast cleaning.
The ASTM specifications relevant to the hot-dip galvanizing industry often reference these surface preparation standards.
Waterjetting is the use of standard jetting from a spc at high pressures 10, psi or higher to prepare sspc sp5 surface for coating. The preparation for painting and powder coating over a hot-dip galvanized coating, as well as the repair of damaged and uncoated areasuse SSPC-SP2 as a standard surface preparation procedure. sspc sp5
This standard covers the removal of sspc sp5 mill scale, loose rust, loose sspc sp5, and other loose detrimental foreign matter from surfaces with the use of non-powered hand tools. Substrate temperature should not be colder surrounding air temperature; otherwise, the moisture can condensate on the cleaned-blast surface dp5 cause flash rust. Power abrading tools also acceptably remove mill scale according to the standard.
The air compressor sp should be checked for oil and water contamination by Blotter Test.
SSPC-SP 5 White Metal Blast Cleaning ( NACE No. 1)
In order to be able to apply white metal blast cleaning be sure that all visible oil, grease, and other contaminant residues are removed. A white metal blast will remove all coatings, mill scale, rust, oxides, corrosion products, and all other foreign products from a steel surface. The dew point is the temperature that condensation sspc sp5. This can be achieved with the use of brushing, blowing off residue with clean, dry air, and vacuum cleaning.
They are considered interchangeable in their use of sspc sp5 the coating and ssoc zinc high spots before the zinc coating is further prepared. Therefore, it is often better than other sspc sp5 cleaning as it requires higher standards of a clean surface. Please subscribe to my monthly newsletter wp5 you don’t miss a sspc sp5.
The standard includes using rotary, impact, sspc sp5 power brushing tools to remove stratified rust, weld slag, and mill scale. D specifically calls out this standard with a condition sspc sp5 the water pressure be below psi. Enter Your First Name optional. Comments Have your say about what you just read!
Once the methods above have been applied, be sure to remove all visible residues from the surface. Usually occurring around after six months of weathering, a finely etched and roughened profile acceptable sspc sp5 paint covers the surface of the galvanized coating. The standard lists dry abrasive blasting as the preferred method with wet blasting an option to be agreed upon between the two parties. SSPC-SP3 requires power tools to be used sspc sp5 a manner that prevents the formation of burrs, sharp ridges, and sspc sp5 cuts.
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. As mentioned prior, after blast cleaning, sspc sp5 sure to meet all surface standards as presented in the coating specification documents. The specifications for preparing hot-dip galvanized steel for paint and powder coating — ASTM D and D respectively — list hand tool sspc sp5 as an acceptable method for smoothing the surface and removing zinc high spots of newly galvanized and partially weathered coatings.
We will be updating and growing this site with more and more of industrial inspection related articles. Therefore, fewer imperfections are acceptable with white metal blast cleaning. In preparation for paint and powder coating, both standards are mentioned by D and D in the same section. Oil, grease, and dust must be removed both before and after the cleaning procedure. Please note random staining, light sspc sp5, discoloration are not allowed to remain on the surface.