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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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. For very small items, several pieces may have to be stripped to obtain the minimum area.
Therefore, the test should be performed under conditions astj adequate ventilation. The same solution may be used repeatedly until the time required for stripping becomes inconveniently long. Determine the weight [mass] of the specimens again, to the same precision as in the initial determination. 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.
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.
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. As the protection is provided by sacri? Where a continuous length is not available, shorter lengths totaling over 12 in. Historical Version s – view previous versions of standard. For results to be reported in metric units, the specimen should have an area of mm2 of sheet Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
Permission rights to photocopy the standard may also be secured from the ASTM website www. The mixing should be performed under an acid fume hood.
If specimens were prepared to the dimensions as provided in Note 2, they shall be presumed to have an area of 5. 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. A coating of zinc on iron or steel articles provides protection against corrosion. 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.
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
ASTM A90/A90M – 13(2018)
Your comments are invited either for revision axtm this standard or for additional standards and should be addressed to ASTM International Headquarters. This requires about 15 to 30 s, except asttm the case of sherardized coatings, which require a somewhat longer time. Originally approved in See Table 1 for a statistical summary of the test results. This standard has been approved for use by agencies of the Department of Defense.
Specifications for zinc-coated articles frequently provide for different classes of coating so that the purchaser can select the coating weight [mass] most suitable to his needs.
Each of ten laboratories tested three replicates of two different materials. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. Since the density of the steel is known 0. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. NOTE 2—For convenience in calculating test results in inch-pound units, the specimen should have an area of 5.
Coating weights [masses] x90 all zinc-coated articles other than sheets are expressed in weight [mass] per unit area of surface. After stripping, wash the specimens by scrubbing them under running water, dip atm hot water, and wipe asmt blow dry. 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.
The specimen of wire may be of any length over 12 in. Precision and Bias Under no circumstances should the water be added to the acid.
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
Link to Active This link will always route to the current Active version of the standard. A coating of zinc on iron or steel articles provides protection against corrosion. Current edition approved April 1, SR means the standard deviation for R reproducibility.
Hydrochloric acid fumes are present, and hydrogen gas is evolved in the stripping process. Unless otherwise indicated, it is intended that all reagents shall conform to the speci? 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.
Mixing must be done by slowly adding sulfuric acid to water due to the heat generated and possible splashing. 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.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?