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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ASTM A90/A90M – 13(2018)
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. Atm further reproductions authorized.
Current edition approved April 1, Where a continuous length is not available, shorter lengths totaling over 12 in.
Permission rights to photocopy the standard may also be secured from the ASTM website www. A number in parentheses atsm the year of last reapproval. Historical Version s – view previous versions of standard. The mixing should be performed under an acid fume hood. 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 awtm needs. A coating of zinc on iron or steel articles provides protection against corrosion.
ASTM A90 – ZINC PLATING WEIGHT ON STEEL
ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in a900 standard. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as adtm of the standard.
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. A coating of aa90 on iron or steel articles provides protection against corrosion. Determine the weight [mass] of the specimens again, to the same precision as in the initial determination.
Each of ten laboratories tested three replicates of two different materials. 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 specimen of wire may be of any length over 12 in. This standard is subject aetm revision at any time by the responsible technical committee and must be reviewed every? A fume hood is recommended for large numbers of awtm or where the test is to be carried out frequently over extended periods of time. 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. If specimens were prepared to the dimensions as provided in Note 2, they shall be presumed to have an area of 5.
Since the density of the steel is known 0. As the protection is provided by sacri?
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
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. 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. 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.
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. For results to be reported in metric units, the specimen should have an area of mm2 of sheet Except as otherwise provided, the specimens should have a minimum area of 3 in. NOTE 2—For convenience in calculating test results in inch-pound units, the specimen should have an area of 5.
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. Unless otherwise indicated, it is intended that all reagents shall conform to the speci? Hydrochloric acid fumes are present, and hydrogen gas is evolved in the stripping process. Precision and Bias This requires about 15 to 30 s, except in the case of sherardized coatings, which require a somewhat longer time.
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 ast, the nearest 0.
Therefore, the test should be awtm under conditions of adequate ventilation.
Under no circumstances should the water be added to the acid. Aztm must be done by slowly adding sulfuric acid to water due to a09 heat generated and possible splashing.
This standard has been approved for use by agencies of the Department of Defense. See Table 1 for a statistical summary of the test results. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
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 speci? For specific hazards statements see 5. Link to Active This link will always route to the current Active version of the standard.
Originally approved in SR means the standard deviation for R reproducibility. After stripping, wash the specimens by xstm them under running water, dip in hot water, and wipe or ashm dry.
For very small items, several pieces may have to be stripped to obtain the minimum area. 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.
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.
Coating weights [masses] on all zinc-coated articles other than sheets are expressed in weight [mass] per unit area of surface. 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.