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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If specimens were prepared to the dimensions as provided in Note 2, they shall be presumed to have an area of 5. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
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. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. The mixing should be performed under an acid fume hood.
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.
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. Therefore, the test should be performed under conditions of adequate ventilation.
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 aztm on a specimen of that area is numerically equal to the weight [mass] of coating in ounces per square foot of sheet.
In the body of this test method, reference to zinc coating shall be interpreted to also include zinc alloy coating except where specifically stated otherwise. No further reproductions authorized.
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
Mixing must be done by slowly adding sulfuric acid to water due to the heat generated and possible splashing. SR means the standard deviation for R reproducibility. 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.
Unless otherwise indicated, it is intended that all reagents shall conform to the speci? The specimen of wire may be of any length over 12 in.
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.
Since the density of the steel is known 0. A number in parentheses indicates the year of last reapproval.
ASTM A90/A90M – 13(2018)
Where a continuous length is not available, shorter lengths totaling over 12 in. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. 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.
This requires about 15 to 30 s, except in the case of sherardized coatings, which require a somewhat longer time. 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.
Under no circumstances should the water be added to the acid. Each of ten laboratories tested three replicates of zstm different materials. Aetm and Bias As x90 protection is provided by sacri?
For results to be reported in metric units, the specimen should have an area of mm2 of sheet As the protection is provided by sacrificial loss of zinc, the degree of protection is proportional to the weight [mass] of zinc coating.
Historical Version s – view previous versions of standard. Determine the weight [mass] of the specimens again, to the same precision as in the initial determination. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Coating weights [masses] on all zinc-coated articles other than sheets are expressed in weight [mass] per unit area asfm surface. Current edition approved April 1, A coating of zinc on iron or steel articles provides protection against corrosion. For very small items, several pieces may have to be stripped to obtain the minimum area. See Table 1 for a statistical summary of the test results. A coating of zinc on aastm or steel articles provides protection against corrosion.