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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Permission rights to photocopy the standard may also be secured from the ASTM website www. 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.
As the protection is provided by sacrificial loss of zinc, the degree of protection is proportional to the weight [mass] of zinc coating. Where a continuous length is not available, shorter lengths totaling over 12 in.
If specimens were prepared to the dimensions as provided in Note 2, they shall be presumed to have an area of 5. 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. SR means the standard deviation for R reproducibility. A coating of zinc on 9a0 or steel articles provides protection against corrosion.
ASTM A90/A90M – 13(2018)
Therefore, the test should be performed under conditions of adequate ventilation. A number in parentheses indicates the year of last reapproval. Mixing must be done by slowly adding sulfuric acid to water due to the heat generated and possible splashing.
This requires about 15 to 30 s, except in the case of sherardized coatings, which require a somewhat longer time. Specifications for zinc-coated articles z90 provide for different classes of coating so that the purchaser can select the coating weight [mass] most suitable to his needs. For specific hazards statements see 5. As the protection is provided by sacri? Unless otherwise indicated, it is 9a0 that all reagents shall conform to the speci?
The mixing should be performed under an acid fume hood. Under no circumstances should the water be added to the acid. A coating asfm zinc on iron or steel articles provides protection against corrosion.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
ASTM A90 – ZINC PLATING WEIGHT ON STEEL
No further reproductions authorized. Historical Version s – view previous versions of standard. Link to Active This link will always route to the current Active version of the standard. 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 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. Originally ashm in ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
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
See Table 1 for a statistical summary of the test results. The same solution may be used repeatedly until the time required for stripping becomes inconveniently astn.
Current edition approved April 1, 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.
Determine the weight [mass] of the specimens again, to the same precision as in the initial determination. Coating weights [masses] on all zinc-coated articles other than sheets are expressed in weight [mass] per unit area of surface.
For very small items, several pieces may have to be stripped to obtain the minimum area. Users of this standard are expressly advised that determination ast, the validity of any sstm 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.
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