ASTM A90 PDF

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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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A coating of zinc on iron or steel articles provides protection against corrosion. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Your comments are invited either for revision of this standard or for astj standards and should be addressed to ASTM International Headquarters.

A number in parentheses indicates the year of last reapproval. 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.

SR means the standard deviation for R reproducibility.

Except as otherwise provided, the specimens should have a minimum area of 3 in. Where a continuous length is not available, shorter lengths totaling over 12 in.

Precision and Bias This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?

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. 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. 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.

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Unless otherwise indicated, it is intended that all reagents shall conform to the speci?

ASTM A90 – ZINC PLATING WEIGHT ON STEEL

Historical Version s – view previous versions of standard. The same solution may be used repeatedly until the time required for stripping becomes inconveniently long. 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.

Hydrochloric acid fumes are present, and hydrogen gas is evolved in the stripping process.

ASTM A90/A90M – 13(2018)

Since the density of the steel is known 0. As the protection is provided by sacri?

Under no circumstances should the water be added to the acid. As the protection is provided by sacrificial asym 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.

This requires about 15 to 30 s, except in the case of sherardized coatings, which require a somewhat longer time. In the body of this test method, reference atsm zinc coating shall be interpreted to also include zinc alloy coating except where speci? For very small items, several pieces may have to be stripped to obtain the minimum area.

Permission rights to photocopy the standard may also aastm secured from the ASTM website www. In the body of this test method, reference to zinc coating shall be interpreted to also include zinc xstm coating except where specifically stated otherwise. NOTE 2—For convenience in calculating test results in inch-pound units, the specimen should have an area of 5.

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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.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. A coating of zinc on iron or steel articles provides protection against corrosion. Each of ten sstm tested three replicates of two different materials. 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 astmm needs.

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 atsm be presumed to have an area of 5. 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. For specific hazards statements see 5.

Current edition approved April 1, 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.

Determine the weight [mass] of the specimens again, to the same precision as in the initial determination.