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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See Table 1 for a statistical summary of the test results. 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.
NOTE 2—For convenience in calculating test results in inch-pound units, the specimen should have an area of 5.
Determine the weight [mass] of the specimens again, to the same precision as in the initial determination. If you feel that your comments have not received a fair hearing qstm should make your views known to the ASTM Committee on Standards, at the address shown below. Unless otherwise indicated, it is intended that all reagents shall conform asmt the speci? Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
As the protection is provided by sacri?
The specimen of wire may be of any length over 12 in. Z90 means the standard deviation for R reproducibility. Permission rights to photocopy the standard may also be secured from the ASTM website www. For specific hazards statements see 5. Where a continuous length is not available, shorter lengths totaling over 12 in. In the body of this test method, reference to zinc coating shall be interpreted to also include zinc 9a0 coating except where specifically stated otherwise.
ASTM A90/A90M – 13(2018)
Coating weights [masses] on all zinc-coated articles other than sheets are expressed in weight [mass] per unit area of surface. A coating of zinc on iron or steel articles provides protection against corrosion. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? 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 asrm sheet.
Ashm, 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. Therefore, the test should be performed under conditions of adequate ventilation.
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
A number in parentheses indicates the year of last reapproval. In the body of this test method, reference to zinc coating shall be interpreted to also include zinc alloy coating except where speci? If specimens were prepared to the dimensions as provided in Note 2, zstm shall be presumed to have an area of 5. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. 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.
Each of ten laboratories tested three replicates of two different materials. The mixing should be performed under an acid fume hood.
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. Your comments are invited qstm for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
As the protection is provided by sacrificial loss of zinc, the degree of protection is proportional to the weight [mass] of zinc coating. 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 same solution may be used repeatedly until the time required for stripping becomes inconveniently long. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
ASTM A90 – ZINC PLATING WEIGHT ON STEEL
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.
Originally approved in A coating of zinc on iron or steel articles provides protection against corrosion. Mixing must be done by slowly adding sulfuric acid to water due to the heat generated and possible splashing. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. For results to be reported in metric units, the specimen should have an area of mm2 of sheet No further reproductions authorized.
Precision and Bias For very small items, several pieces may have to be stripped to obtain the minimum area.