ASTM A90 PDF
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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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?
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. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service x90.
Therefore, the test should be performed under conditions of adequate ventilation. For very small items, several pieces may have to be stripped to obtain the minimum area. Determine the weight [mass] of the specimens again, to the same precision as in the initial determination.
Originally approved in Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. It is the responsibility of the user of this standard to establish appropriate safety and health practices atsm determine the applicability of regulatory limitations prior to use.
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 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. In the body of this a0 method, reference to zinc coating shall be interpreted to also include zinc alloy coating except where specifically stated otherwise.
Link to Active This link will always route to the current Active version of the standard. This standard has been approved for use by agencies of the Department of Defense.
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.
Historical Version s – view previous versions of standard. No further reproductions authorized.
Since the density of the steel is known 0. Each of ten laboratories tested three replicates of two different materials. Permission rights to photocopy the standard may also be secured from the ASTM website www.
Referenced Documents purchase separately The documents listed below asfm referenced within the subject standard but are not provided as part of the standard. The specimen of wire may be of any length over 12 in. 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.
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Coating weights [masses] on zstm zinc-coated articles other than sheets are expressed in weight [mass] per unit area of surface.
ASTM A90 – ZINC PLATING WEIGHT ON STEEL
Certain portions of the procedure involving determination of asgm weight [mass] have traditionally been performed in SI units, and corresponding inch-pound units are not included. Current edition approved April 1, NOTE 2—For convenience in calculating test results in inch-pound units, the specimen should have an area of 5. This requires about 15 to 30 s, except in the case of sherardized coatings, which require a somewhat longer time.
ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Precision and Bias 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.
SR means the standard deviation for R reproducibility. Where a continuous length is not available, shorter lengths totaling over 12 in.
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. After stripping, wash the specimens by scrubbing them under running water, dip in hot water, and wipe or blow dry. A coating of zinc on iron or steel articles provides protection against corrosion. A number in parentheses indicates the year of last reapproval.
ASTM A90/A90M – 13(2018)
The same solution may be used repeatedly until the time required for stripping becomes inconveniently long. As the protection is provided by sacri? For results to be reported in metric units, the specimen should have an area of mm2 of sheet Hydrochloric acid fumes are present, and hydrogen gas is evolved in the stripping process.
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.
Under no circumstances should the water be added to the acid. Except as otherwise provided, the specimens should have a minimum area of 3 in. Mixing must be done by slowly adding sulfuric acid to water due to the heat generated and possible splashing.