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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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. Mixing must be done by slowly adding sulfuric acid to water due to the heat generated and possible splashing.
A coating of zinc on iron or steel articles provides protection against corrosion. The mixing should be performed under a900 acid fume hood. 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by the responsible technical committee and must be reviewed every five years and if not revised, either reapproved or withdrawn.
ASTM A90 – Free Download PDF
Size px x x x x 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.
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.
We need your help! Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Coating weights [masses] on all zinc-coated articles other than sheets are expressed in weight [mass] per unit area of surface.
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
Please fill this form, we will try to respond as soon as possible. Link to Active This link will always route to the current Active axtm of the standard. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are a990 provided as part of the standard.
For results to be reported in metric units, the specimen should have an area of mm2 of sheet 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.
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.
Current edition approved April 1, Under no circumstances should the water be added to the acid.
Since the density of the steel is known 0. A coating of zinc on iron or steel articles provides protection against corrosion. 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.
Specifications for zinc-coated articles frequently provide for different classes of coating so that asrm purchaser can select the s90 weight [mass] most suitable to his needs.
Significance and Use 3. 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. SR means the standard deviation for R reproducibility.
It a9 the responsibility of the user of this standard to establish appropriate safety and health practices and astn the applicability of regulatory limitations prior to use.
Please help us to share our service with your friends. As the protection is provided by sacrificial loss of zinc, the degree of protection is proportional to the weight [mass] of zinc coating. A number in parentheses indicates the year of last reapproval.
Hydrochloric acid fumes are present, and hydrogen gas is evolved in the stripping process. Each of ten laboratories tested three replicates of two different materials.
Precision and Bias For specific hazards statements see 5. 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 0. It q90 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.
Please copy and paste this embed script to where you want to embed Embed Script. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. 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.
This standard has been approved for use by agencies of the Department of Defense.
Except as otherwise provided, the specimens should have a minimum area of 3 in. Originally approved in