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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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 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.
See Table 1 for a statistical summary of the test results. Link to Active This link will always route ashm the current Active version of the standard. Precision and Bias SR means the standard aa90 for R reproducibility. 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 s90.
Since the density of the steel is known 0. Coating weights [masses] on all zinc-coated articles other than sheets are expressed in weight [mass] per unit area of surface. In the body of this test method, reference to zinc coating shall be interpreted to also include zinc alloy coating except where speci?
Current edition approved April 1, Therefore, the test should be performed under conditions of adequate ventilation. A coating of zinc on iron or steel articles provides protection against corrosion. After stripping, wash the specimens by scrubbing them under running water, dip in hot water, and wipe or blow dry. Permission rights to photocopy the standard may also be secured from the ASTM website www.
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. For results to be reported in metric units, the specimen should have an area of mm2 of sheet If specimens were prepared to the dimensions as provided in Note 2, they shall be presumed to have an area of 5.
Where a continuous length is not available, shorter lengths totaling over 12 in. A number in parentheses indicates the year of last reapproval.
ASTM A90/A90M – 13(2018)
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 standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
No further reproductions authorized. The mixing should be performed under an acid fume hood. Each astk ten laboratories tested three replicates of two asgm materials.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. As the protection is provided by sacri? 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. 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.
The specimen of wire may be of any length over 12 in. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
Historical Version s – view previous versions of standard. 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 aastm agencies of the Department of Defense. A coating of zinc on iron or steel articles provides protection against corrosion. Asttm reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
sstm 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. Determine the weight [mass] of the specimens again, to the same precision as in the initial determination. Originally approved in ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
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.
The same solution may be used repeatedly until the time required for stripping becomes inconveniently long.
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
As the protection is provided by sacrificial loss of zinc, the degree of protection is proportional to the weight [mass] of zinc coating. Except as otherwise provided, the specimens should have a minimum area of 3 in.
This requires about 15 to 30 s, except in the case a9 sherardized coatings, which require a somewhat longer time. For specific hazards statements see 5. Under no circumstances should the water be added to the acid. Certain portions of the procedure involving determination of specimen weight [mass] have traditionally been performed in Aetm units, and corresponding inch-pound units are not included.
Hydrochloric acid fumes are present, and hydrogen gas is evolved in the stripping process. Unless otherwise indicated, it is intended that all reagents shall conform to the speci? Mixing must be done by slowly adding sulfuric acid to water due to the heat generated and possible splashing. In the body of this test method, reference to zinc coating shall be interpreted to aastm include zinc alloy 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. For very small items, several pieces may have to be stripped to obtain the minimum area.