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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A number in parentheses indicates the year of last reapproval. This standard has been approved for use by agencies of the Department of Defense. In the body of this test method, reference to zinc coating shall be interpreted to also include zinc alloy coating except where speci? Certain portions of the astn involving determination of specimen weight [mass] have traditionally been performed in SI units, and corresponding inch-pound units are not included.
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 coating of zinc asrm iron or steel articles provides protection against corrosion.
As the protection is provided by sacri? Current edition approved April 1, Originally approved in No further reproductions authorized. Unless otherwise indicated, it is intended that all reagents shall conform to the speci?
ASTM A90 – ZINC PLATING WEIGHT ON STEEL
NOTE 2—For convenience in calculating test results in inch-pound units, the specimen should have an area of 5. The weight [mass] of coating in grams on a0 specimen of that area is numerically equal to the weight [mass] of coating in ounces per square foot of sheet. For results to be reported in metric units, the specimen should have an area of mm2 of sheet The specimen of wire may be of any length over 12 in.
Where a continuous length is not available, shorter lengths totaling over 12 in. Since the density of the steel is known 0. Except as otherwise provided, the specimens should have a minimum area of 3 in.
For very small items, several pieces may have to be stripped to obtain the minimum area. 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. axtm
This requires about 15 to 30 s, except in the case of sherardized coatings, which require a somewhat longer time. The same solution may be used repeatedly until the time required for stripping becomes inconveniently long.
After stripping, wash the specimens by scrubbing them under running water, dip in hot water, and wipe or blow dry. Determine the weight [mass] of the specimens again, to the same precision as in the initial determination. Hydrochloric acid fumes are present, and hydrogen gas is evolved in the stripping process. Therefore, the test should be performed under conditions of adequate ventilation.
A fume hood is recommended for large numbers of samples or where the test is to be carried out frequently over extended periods of time. Mixing must be done by slowly adding sulfuric acid to water due to the heat generated and possible splashing. Under no circumstances should the water be added to the acid. The mixing should be performed under an acid fume hood.
If specimens aztm prepared to the dimensions as provided in Note 2, they shall be presumed to have an area of 5. 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.
Alternatively, for specimens of uniform thickness of base metal, such as a piece of a9 or pipe, determine the average thickness of the stripped specimen 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. Precision and Bias Each of ten laboratories tested three replicates of two different materials.
See Table 1 for a statistical summary of the test results. SR means the standard deviation for R reproducibility.
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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
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ASTM A90/A90M – 13(2018)
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