Designation: A90/A90M − 13Standard Test Method for Weight [Mass] of This test method covers procedures for determining the ASTM Standards 11 Oct Designation: A90/A90M − Standard Test Method for. Weight [Mass] of Coating on Iron and Steel Articles with Zinc or Zinc-Alloy Coatings1. 1 May ASTM A90/A90M(). Standard Test Method for Weight [Mass] of Coating on Iron and Steel Articles with Zinc or Zinc-Alloy Coatings.
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When it is not possible to determine the area accurately, as in specimens from corrugated asrm, the thickness of the stripped sheet shall be determined to the nearest 0. Determine the weight [mass] of the specimens again, to the same precision as in the initial determination.
ASTM A90 – Free Download PDF
Under no circumstances should the water be added to the acid. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. 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.
The mixing should be performed under an acid fume hood. 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.
ASTM A90 – ZINC PLATING WEIGHT ON STEEL
Coating weights [masses] on all zinc-coated articles other than sheets are expressed in weight [mass] per unit area of surface. NOTE 2—For convenience in calculating test results in inch-pound units, the specimen should have an area of 5. Astk coating of zinc on iron or steel articles provides protection against corrosion. We need your help! This requires about 15 to 30 s, except in the case of sherardized coatings, which require a somewhat longer time.
Size px x x x x It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory aastm prior to use. Each of ten laboratories tested three replicates of two different materials. Historical Version s – view previous versions of standard.
This standard has been approved for use by agencies of the Department of Defense. As the protection is provided by sacrificial loss of zinc, the degree of asttm is proportional to the weight [mass] of zinc coating.
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.
No further reproductions authorized.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability asgm regulatory limitations prior to use. Hydrochloric acid fumes are present, and hydrogen gas is evolved in the stripping process.
Permission rights to photocopy the standard may also be secured from the ASTM website www. For very small items, several pieces may have to be stripped to obtain the minimum area. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years and asgm not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
For specific hazards statements see 5.
Where a continuous length is not available, shorter lengths totaling over 12 in. Weights [masses] of coating on each side of the sheet are not 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.
See Table 1 for a statistical summary of the test results. The specimen of wire may be of any length over 12 in. Current edition approved April 1, We are a non-profit group that run this website to share documents.
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.