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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A coating of zinc on iron or steel articles provides protection against corrosion.
ASTM A90 – ZINC PLATING WEIGHT ON STEEL
Originally approved in Historical Version s – view previous versions of standard. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
Where a continuous length is not available, shorter lengths totaling over 12 in. Alternatively, asmt specimens of uniform thickness of base s90, such as a piece of plate z90 pipe, determine the asstm thickness of the stripped specimen to the nearest 0.
A coating of zinc on iron or steel articles provides protection against corrosion. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. 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. This requires about 15 to 30 s, except in the case of sherardized coatings, which require a somewhat longer time.
Link to Active This link will always route to the current Active version of the standard. For very small items, several pieces may have to be stripped to obtain the minimum area.
This standard has been approved for use by agencies of the Department of Defense. The specimen of wire may be of any length over 12 in. After stripping, wash the specimens by scrubbing them under running water, dip in hot water, and wipe or blow dry. Hydrochloric acid fumes are present, and hydrogen gas is evolved in the stripping process.
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. 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. As the protection is provided by sacrificial loss of zinc, the degree of protection is proportional to the weight [mass] of zinc coating.
Mixing must be done by slowly adding sulfuric acid to water due to the heat generated and possible splashing. 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.
Under no circumstances should the water be added to the acid. 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.
Current edition approved April 1, ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Unless otherwise indicated, it is intended that all reagents shall conform to the speci?
Precision and Bias Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Therefore, the test should be performed under aastm of adequate ventilation. Since the density of the steel is known 0. Except as otherwise provided, the specimens should have a minimum area of 3 in. Users of this standard are expressly ast that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
For specific hazards statements see 5. Determine the weight [mass] of the specimens again, to the same precision as in the initial determination. 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.
ASTM A90/A90M – 13(2018)
NOTE 2—For convenience in calculating test results in inch-pound units, the specimen should have an area of 5. If you feel that your comments have q90 received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.
Permission rights to photocopy the standard may also be secured from the ASTM website www. Coating weights [masses] on all zinc-coated articles other than sheets are expressed in weight [mass] per unit area of surface. Each of ten laboratories tested three replicates of two different materials.
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. The same solution may be used z90 until the time required for stripping becomes inconveniently long.
A number in parentheses indicates the year of last reapproval. 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.
Your comments are invited either for revision of this a09 or for additional standards and should be addressed to ASTM International Headquarters. The mixing should be performed under an acid fume hood. No further reproductions authorized. If specimens were prepared to the dimensions as provided in Note 2, they shall be presumed to have an area of 5. The weight [mass] of coating in grams on a specimen of that area aa90 numerically equal to the weight [mass] of coating in ounces per square foot of sheet.
SR means the standard deviation for R reproducibility. As the protection is provided by sacri? In the body of this test method, reference to zinc coating shall be interpreted ast, also astn zinc alloy coating except where speci? See Table 1 for a statistical summary of the test results.
For results to be reported in metric units, the specimen should have an area of mm2 of sheet