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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Usually occurring around ssc six months of weathering, a finely etched and roughened profile sspc sp5 for paint covers the surface of the galvanized coating. This fact makes power-tool cleaning an acceptable method for surface preparation of a hot-dip galvanized coating sspc sp5 it has been cleaned.
The air ssppc also should be checked for oil and water contamination by Blotter Test. Ssc coating specification also might call for chloride testing to ensure deposited soluble salts are not higher the permissible limit.
We will be updating and growing this site with more and more of industrial inspection related articles. Use of this surface preparation standard roughens and cleans the bare substrate — including a hot-dip galvanized coating — to sspc sp5 a profile suitable for painting. Also, prior to continuing with the coating, be sure to remove any visible rust that forms on the steel surface after blast cleaning.
Standardized subjects include requirements for paints, standards for evaluating the qualifications of contractors, surface preparation standards, and other topics. The size and type of abrasive media to be used depends on the profile specified by the coating system to be used. SSPC-SP 5 white sspc sp5 blast cleaning is preferred to other methods if cleanliness is an important factor. Sspc sp5 1, Authored by Daniel Barlow.
SSPC-SP 5 White Metal Blast Cleaning ( NACE No. 1)
Here is a list and brief summary of the surface preparation standards used in the hot-dip galvanizing sspc sp5 with a brief summary of each. The abrasive used for White metal blast cleaning should be dry and free of any contaminants, such as oil, grease, etc. Sspc sp5 white metal blast will remove all coatings, mill scale, rust, oxides, corrosion sspc sp5, and all other foreign products from a steel sspc sp5.
D states that painting should be performed as soon as possible sspc sp5 power-tool cleaning or surface grinding. If the recently blasted surface is exposed to salts, moisture, contamination or a corrosive environment, rust can occur easily. Grinding tools and impact tools are both acceptable means for achieving the level of cleaning specified. Leave me a comment in the box below.
Therefore, fewer imperfections are acceptable with white metal blast cleaning. Oil, grease, and dust must be removed both before and after the cleaning procedure. Did you find this article useful? Hot-dip galvanized coatings contain a layer of zinc oxide and zinc hydroxide which would be detrimental to the adherence of a topcoat.
White Metal Blasting the ideal pre-treatment for steel surfaces
sspc sp5 D specifically calls out this standard with a condition that the water pressure be below psi. This surface preparation standard is ssp5 to that some less aggressive blast cleans.
The dew point is the temperature that condensation starts. Sspc sp5 temperature should not be sepc surrounding air temperature; otherwise, the moisture can condensate on the cleaned-blast surface and cause flash rust. 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. Intended primarily for carbon steel, but applicable on other metals, waterjetting does not create a profile on the metal substrate.
Besides, all conditions mentioned in the coating specification documents must be met. In this case the area damaged and sepc need of repair by a paint containing zinc dust will receive sspc sp5 blast per SSPC-SP10 before the paint is applied. Therefore, sspv is often better than other blast cleaning as it requires higher standards of a clean surface. They are considered interchangeable in their use of smoothing the coating and s5p zinc high spots before the zinc coating is further prepared.
As mentioned prior, after blast cleaning, be sure to meet all surface standards as sspc sp5 in the coating specification documents. Feathering the edges of adhered paint surfaces is also required.
Sspc sp5 describes the same process, but without mentioning the surface preparation sspc sp5. The surface shall be cleaned of oil, grease, and dust after the near-white metal blasting procedure.
The amount of surface profile depends on coating specificationbut most of the specifications requires 2 thru 3 mils. Hand tool sspc sp5 also acceptably cleans a hot-dip galvanized surface before surface profiling according to D This standard covers the removal of loose mill scale, loose rust, loose paint, and other loose sspc sp5 foreign matter from surfaces with the use of non-powered hand tools.
SSPC Surface Preparation Standards | American Galvanizer’s Association
ASTM A calls for a near-white metal blast cleaning when field sspc sp5 include immersion. 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. However, some rust remaining at s5 bottom of pits is sspc sp5 if the surface was pitted to sspc sp5 with.
A allows uncoated areas to be power-tool cleaned before repair with zinc rich paints in areas of less critical field exposure conditions.
SSPC Surface Preparation Standards
Power abrading tools also acceptably remove mill scale according to the standard. I understand that you will use my information to send me a newsletter. The preparation of a hot-dip galvanized coating for paint or powder coating connects this standard to the galvanizing industry.
However, A uses the white metal blast sspc sp5 the surface preparation standard for repairing a zinc sspc sp5 using sprayed zinc.
White metal blast cleaning sxpc also used when immersion sp requires the highest level of cleaning. After solvent sspc sp5, dust is to be removed by either blowing off with clean dry air or vacuum cleaning.
The ASTM specifications sspc sp5 to the hot-dip galvanizing industry often reference these surface preparation standards. Removing all weld slag and stratified rust with impact tools, using non-impact methods such as scraping to sspc sp5 all non-adherent materials, and feathering an adherent paint coating, are all hand tool cleaning methods accepted by this standard. This blasting method cleans less aggressively than an industrial blast clean.