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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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. 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 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. 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. NOTE 2—For convenience in calculating test results in inch-pound units, the specimen should have an area of 5. Under no circumstances should the water be added to the acid.
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.
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.
Thank you for interesting in our services. This standard has been approved for use by agencies of the Department of Defense. We are a non-profit group that run this website to share documents. As the protection is provided by sacrificial loss of zinc, the degree of protection is proportional to the weight [mass] of zinc coating.
Determine the weight [mass] of the specimens again, to the same precision as in the initial determination.
ASTM A90 – ZINC PLATING WEIGHT ON STEEL
After stripping, wash the specimens by scrubbing them under running water, dip in hot water, and wipe or blow dry. 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.
If specimens were prepared to the dimensions as provided in Note 2, they shall be presumed to have an area astk 5. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years and if not revised, either reapproved s90 withdrawn. For specific hazards statements see 5. Where a continuous length is not available, shorter lengths totaling over 12 in. 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 sacrificial loss of zinc, the degree of protection is proportional to the weight [mass] of zinc coating. Unless otherwise indicated, it is intended that all reagents shall conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society, where such specifications are available.
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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. For very small items, several pieces may have to be stripped to obtain the minimum area. SR means the standard deviation for R reproducibility.
This requires about 15 wstm 30 s, except in the case of sherardized coatings, which require a somewhat longer time.
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. Size px x x x x See Table 1 for a z90 summary of the test results. Alternatively, for specimens of uniform thickness of base metal, such as a piece of plate or pipe, determine a09 average thickness of the stripped specimen to the nearest 0.
Except as otherwise provided, the specimens should have a minimum area of 3 in. 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. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. For specific hazards statements see 5.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Permission rights to photocopy the standard may also be secured from the ASTM website www.
Weights [masses] of coating on each side ast the sheet are not Mixing must be done by slowly adding sulfuric acid to w90 due to the heat generated and possible splashing. 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. Current edition approved April 1, 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.