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.
NOTE 2—For convenience in calculating test results in inch-pound units, the specimen should have an area of 5. This standard has been approved for use by agencies of the Department awtm Defense.
ASTM A90/A90M – 13(2018)
A number in parentheses indicates the year of last reapproval. As the protection is provided by sacrificial loss of zinc, the degree of protection is proportional to the weight [mass] of zinc coating. For specific hazards statements see 5. A coating of zinc on iron or steel articles provides protection against corrosion. As the protection is provided by sacri? Mixing must be done by slowly adding sulfuric acid to water due to the heat generated and possible splashing.
Coating weights [masses] on all zinc-coated articles other than sheets are expressed in weight [mass] per unit area of surface. No further reproductions authorized.
ASTM A90 – ZINC PLATING WEIGHT ON STEEL
Current edition approved April 1, Where a continuous length is not available, shorter lengths totaling over 12 in. Therefore, the test should be performed under conditions of adequate ventilation. If specimens were prepared to the dimensions as provided in Note 2, they shall be presumed to have an area of 5. Except as otherwise provided, the specimens should have a minimum area of 3 in.
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. Permission rights to photocopy qstm standard may also be secured from the ASTM asmt www. Hydrochloric acid fumes are present, and hydrogen gas is evolved in the stripping process.
Precision and Bias 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. A900 otherwise indicated, it is intended that all reagents shall conform to the speci?
Link to Active This link will always route to the atm Active version of the standard. Under no circumstances should the water be added to the acid.
Alternatively, for specimens of uniform thickness a09 base metal, such as a piece of plate or pipe, determine the average thickness of the stripped specimen to the nearest 0. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
The same solution may be used repeatedly until the time required for stripping becomes inconveniently long. Individual reprints single or a9 copies of this standard may be obtained asfm contacting ASTM at the above axtm or at phonefaxor service astm.
The specimen of wire may be of any length over 12 in. Users of this standard are expressly advised that determination of the validity of any such s90 rights, and the risk of infringement of such rights, are entirely their own responsibility. 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.
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. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. For results to be reported in metric units, the specimen should have an area of mm2 of sheet In the body of this test method, reference to zinc coating shall be interpreted to also include zinc alloy coating except where speci?
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
The mixing should be performed under an acid fume hood. 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. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
Each of ten laboratories tested three replicates of two different materials. After stripping, wash the specimens by scrubbing them under running water, dip in hot water, and wipe or blow dry.
Your comments will receive careful consideration ast a meeting of the responsible 9a0 committee, which you may attend. 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. 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.
It is the responsibility of the user of this aa90 to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
A coating of zinc on iron or steel articles provides protection against corrosion. This requires about 15 to 30 s, except in the case of sherardized coatings, which require a somewhat longer time.
Since the density of the steel is known 0. 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.