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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For very small items, several pieces may have to be stripped to obtain the minimum area. Your comments will receive careful consideration at a meeting of the responsible technical zstm, which you may attend. Determine the weight [mass] of the specimens again, to the same precision as in the initial determination.
A coating of zinc on iron or steel articles provides protection against corrosion. As the protection is provided by sacrificial loss of zinc, the degree of protection is proportional to the weight [mass] of zinc coating. 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.
Link to Active This link will always route to the current Active version of the standard. Therefore, the test should be performed under conditions of adequate ventilation. The specimen of wire may be of any length over 12 in.
ASTM A90/A90M – 13(2018)
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are ast, provided as part of the standard. SR means the standard deviation for R reproducibility.
X90, 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. Each of ten laboratories tested three replicates of two different materials. Permission rights to photocopy the standard may also be secured from the ASTM website www. As the protection is provided by sacri?
Except as otherwise provided, the specimens should have a minimum area of 3 in. 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. 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. After determining the weight [mass], immerse each specimen singly in the stripping solution and allow to remain until the violent evolution aastm 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.
ASTM A90 – ZINC PLATING WEIGHT ON STEEL
See Table 1 for a statistical summary of the test results. After stripping, wash the specimens by scrubbing them under running water, dip in hot asmt, and wipe or blow dry.
Coating weights [masses] on all zinc-coated articles other than sheets are expressed in weight [mass] per unit area of surface. For specific hazards statements see 5.
In the body of this test method, reference to zinc coating shall be interpreted to also include zinc alloy coating except where speci? A number in parentheses indicates the year of last reapproval. Unless otherwise indicated, it is intended that all reagents shall conform to the speci? Where a continuous length is not available, shorter lengths totaling over 12 in.
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?
Hydrochloric acid fumes are present, and hydrogen gas is evolved in the stripping process. 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. Under no circumstances should the water be added to the acid. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
A coating of zinc on iron or steel articles provides protection against corrosion. 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
Precision and Bias 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. This standard has been approved for use by agencies of the Department of Defense. 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. 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 a specimen of that area is numerically equal to the weight [mass] of coating in ounces per square foot of sheet. 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.
Originally approved in 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.