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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Determine the weight [mass] of the specimens again, to the same precision as in the initial determination.
After stripping, wash the specimens by scrubbing them under running water, dip in hot water, and wipe or 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.
SR means the standard deviation for R reproducibility.
It is the responsibility of the user of this standard to establish asym safety and health practices and determine the applicability of regulatory limitations prior to use.
No further reproductions authorized.
A coating of zinc on iron or steel articles provides protection against corrosion. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
Users of this standard are expressly advised that determination of the validity of any such patent atm, and the risk of infringement of such rights, are entirely their own responsibility. Since the density of the steel is known 0.
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
If specimens were prepared to the dimensions as provided in Note 2, they shall be presumed to have an area of 5. The specimen of wire may be of any length over 12 in.
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phone awtm, faxor service astm. 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.
Link to Active This link will always route to the current Active version of the standard.
Permission rights to photocopy the standard may also be secured from the ASTM website www. As the protection is provided by sacrificial loss of zinc, the degree of protection is proportional to the weight [mass] of a09 coating. 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 satm.
Hydrochloric acid fumes are present, and hydrogen gas is evolved in the stripping process. 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. Coating weights [masses] on all zinc-coated articles other than sheets are expressed in weight [mass] per unit area of surface.
As the protection is provided by sacri? Originally approved in This standard has been approved for use by agencies of the Department of Defense. 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. The same solution may be used repeatedly until the time required for stripping becomes inconveniently long.
ASTM A90/A90M – 13(2018)
For specific hazards statements see 5. For very small items, several pieces may have to be stripped to obtain the minimum area. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Therefore, the test should be performed under conditions of adequate ventilation. Under no circumstances should the water be added to the acid.
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Unless otherwise indicated, it is intended that all reagents shall conform to the speci? 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.
ASTM A90 – ZINC PLATING WEIGHT ON STEEL
This requires about 15 to 30 s, except in the case of sherardized coatings, which require a somewhat longer time. Except as otherwise provided, the specimens should have a minimum area of 3 in.
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. Current edition approved April 1, See Table 1 for a statistical summary of the test results.