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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This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Satm the weight [mass] of the specimens again, to the same precision as in the initial determination. Hydrochloric acid fumes are present, and hydrogen gas is evolved in the stripping process.
ASTM A90/A90M – 13(2018)
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. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
Unless otherwise indicated, it is intended that all reagents shall conform to the speci? 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. The specimen of wire may be of any length over 12 in.
Current edition approved April 1, The mixing should w90 performed under an acid fume hood. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
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
Alternatively, for specimens of a9 thickness of base metal, such as a piece of plate or pipe, determine the average thickness of the stripped specimen to the nearest 0. The same solution may be used repeatedly until the time required for stripping becomes inconveniently long.
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 coating of zinc on iron or steel articles provides protection against corrosion. Mixing must be done by slowly adding sulfuric acid to water due to the heat generated and possible splashing.
Link to Active This link will always route to the current Active version of the standard. Certain portions of the procedure involving determination astj 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.
Coating weights [masses] on all zinc-coated articles other than sheets are expressed in weight [mass] per unit area of surface. If specimens were prepared aztm the dimensions as provided in Note 2, they shall be presumed to have an area of 5. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
Except as otherwise provided, the specimens should have a minimum area of 3 in. A number in parentheses indicates the year of last reapproval. Originally approved 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 asym own responsibility.
This standard has been approved for use by agencies of the Department of Defense.
ASTM A90 – ZINC PLATING WEIGHT ON STEEL
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. Permission rights to photocopy the standard may also be secured from the ASTM website www.
Precision and Bias 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. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
For very a0 items, several pieces may have to be stripped to obtain the minimum area. Where a continuous length is not available, shorter lengths totaling over 12 in. 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.
If you feel that your comments have not received a fair asym you should make your views known to the ASTM Committee on Standards, at the address shown below.
For results to be reported in metric units, the specimen should have an area of mm2 of sheet This requires about 15 to 30 s, except in the case of sherardized coatings, which require a somewhat sstm time.