ASTM A90 PDF
ASTM A90/A90M(). Standard Test Method for Weight [Mass] of Coating on Iron and Steel Articles with Zinc or Zinc-Alloy Coatings. ASTM A ZINC PLATING WEIGHT ON STEEL. This test method covers procedures for determining the weight [mass] of coating on iron or steel sheet, wire, and. A. ASTM A90 – Standards Test Method for Weight of Coating on F. ASTM A — Steel Sheet, Zinc Coated (Galvanized) or Zinc-Iron Alloy.
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The same solution asmt be used repeatedly until the time required for stripping becomes inconveniently long. NOTE 2—For convenience in calculating test results in inch-pound units, the specimen should have an area of 5. A coating of zinc on iron or steel articles provides protection against corrosion.
SR means adtm standard deviation for R reproducibility. The mixing should be performed under an acid fume hood. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Current edition approved April 1, Unless otherwise indicated, it is intended that all reagents shall conform to the speci?
In the body of this test method, reference to zinc coating shall be interpreted to also include zinc alloy coating except where speci? For specific hazards statements see 5. As the protection is provided by sacrificial loss of zinc, the degree of protection is proportional to the weight [mass] of zinc coating.
ASTM A90／A90M 13镀锌和镀锌合金钢铁制品镀层重量的试验方法_百度文库
Under no circumstances should the water be added to the acid. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
The weight [mass] of coating in grams on a specimen of that area is numerically equal to the weight [mass] of coating in ounces per square foot of sheet. After stripping, wash the specimens by scrubbing them under running water, dip in hot water, and wipe or blow dry.
Alternatively, for specimens of uniform thickness of base metal, such as a piece of plate or pipe, determine the average thickness of the stripped specimen to the nearest 0.
ASTM A90/A90M – 13(2018)
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. A number in parentheses indicates the year of last reapproval. Except as otherwise provided, the specimens should have a minimum area of 3 in.
As the protection is provided by sacri? Determine the weight [mass] of the specimens again, to the same precision as in the initial determination. Zstm to Active This link will always route to the current Active version of the standard.
When it is not possible to determine the area accurately, as in specimens from corrugated sheets, the thickness of the stripped sheet shall be determined to the nearest 0. Coating weights [masses] on all zinc-coated articles other than sheets are expressed in weight [mass] per unit area of surface.
This standard has been approved for use by agencies of the Department of Defense. In the body of this test aastm, reference to zinc coating shall be interpreted to also include zinc alloy coating except where specifically stated otherwise.
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Certain portions of the procedure involving determination of specimen weight [mass] have traditionally been performed in SI units, and corresponding inch-pound units are not included. After determining the weight [mass], immerse each specimen singly in the stripping solution and allow to remain until the violent evolution of hydrogen has ceased, and only a few bubbles are being evolved.
No further reproductions authorized. W90 a continuous length is not available, shorter lengths totaling over 12 in. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Each of ten laboratories tested three replicates of two different materials.