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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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

Since the density of the steel is known 0. Historical Version s – view previous versions of standard. The mixing should be performed under an acid fume hood. A coating of zinc on iron or steel articles provides protection against corrosion.

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

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.

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.

Except as otherwise provided, the specimens should have a minimum area of 3 in. The same solution may be used repeatedly until the time required for stripping becomes inconveniently long. When it is not possible to determine the area accurately, a9 in specimens from corrugated sheets, the thickness of the stripped sheet shall be determined to the nearest 0.


As the protection is provided by sacrificial loss of zinc, the degree of protection is proportional to the weight [mass] of zinc coating. Under no circumstances should the water be added to the acid. Coating weights [masses] on all zinc-coated articles other asm sheets are expressed in weight [mass] per unit area of surface.

Asym the body of this test method, reference to zinc coating shall be interpreted to also include zinc alloy coating except where speci? Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. After determining the weight [mass], immerse each specimen singly in the stripping solution and allow aa90 remain until the violent evolution of hydrogen has ceased, and only a few bubbles are being evolved.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Precision and Bias Where a continuous length is not available, shorter lengths totaling over 12 in.

Mixing must be done by slowly adding sulfuric acid to water due to the heat generated and possible splashing. Link to Active This link will always route to the current Active version of the standard.

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 number in parentheses indicates the year of last reapproval.


ASTM A90/A90M – 13(2018)

Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Users of this standard are xstm advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.

This standard has been approved for use by agencies of the Department of Defense. Unless otherwise indicated, it is intended that all reagents shall conform to the speci? Each of ten laboratories aatm three replicates of two different materials.

Therefore, the test should be performed under conditions of adequate ventilation.


No further reproductions authorized. 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.

NOTE 2—For convenience in calculating test results in inch-pound units, the specimen should have an area of 5. 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. Hydrochloric acid fumes are present, and hydrogen gas is evolved in the stripping process. A900 approved in If specimens were prepared to the dimensions as provided in Note 2, they shall be presumed to have an area of 5.