March 31, 2019


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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Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. SR means the standard deviation for R reproducibility.

Under no circumstances should the water be added to the acid. For very small items, several pieces may have to be stripped to obtain the minimum area. The specimen of wire may be of any length over 12 in. 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 aztm.

The mixing should be a0 under an acid fume hood. Certain portions of the procedure involving determination of specimen weight [mass] have traditionally been performed in Asttm units, and corresponding inch-pound units are not included. 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.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided asttm part of the standard. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.

Mixing must be done by slowly adding sulfuric acid to water due to the heat generated and possible splashing.

This standard has been approved for use by agencies of the Department of Defense. A coating of zinc on iron or steel articles provides protection against corrosion.


Each of ten laboratories tested three replicates of two different materials.

As the protection is provided by sacrificial aztm of zinc, the degree aztm protection is proportional to the weight [mass] of zinc coating. Except as otherwise provided, the specimens should have a minimum area of 3 in. Coating weights [masses] on all zinc-coated articles other than sheets are expressed in weight [mass] per unit area of surface. This requires about 15 to 30 s, except in the case of sherardized coatings, which require a somewhat longer time.

A coating of zinc on iron or steel articles provides protection against corrosion.

ASTM A90/A90M – 13(2018)

Permission rights to photocopy the standard may also be secured from the ASTM website www. If specimens were prepared to the dimensions as provided in Note 2, they shall be presumed to have an area of 5. In astn body of this test method, reference to zinc coating shall be interpreted to also include zinc asm coating except where specifically stated otherwise.

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.

A number in parentheses indicates the year of last reapproval. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Since the density of the steel is known 0. Current edition approved April 1, Alternatively, for specimens of uniform thickness of base metal, such as a piece of plate or pipe, determine the asmt thickness of the stripped specimen to the nearest 0. Determine the weight [mass] of the specimens again, to the same precision as in the initial determination.

No further reproductions authorized. After stripping, wash the specimens by scrubbing them under running water, dip in hot water, and wipe or blow dry. The same solution may be used repeatedly until the time required for stripping becomes inconveniently long. Zstm 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 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.


Link to Active This link will always route to the current Active version of the standard.

After determining the weight [mass], immerse each specimen singly in the stripping solution and allow to remain until the violent evolution of hydrogen has ceased, and only a few bubbles are being evolved. 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. Therefore, the test should be performed under conditions of adequate ventilation. For results to be reported in metric units, the specimen should have an area of mm2 of sheet 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.


Originally approved in For specific hazards statements see 5. Historical Version s – view previous versions of standard. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

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. Users of this standard are expressly advised that determination of the validity of zstm such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.

As the protection is provided by sacri?