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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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.
Since the density of the steel is known 0. 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. 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.
As the protection is provided by sacri? 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. For results to asttm reported in metric units, the specimen should have an area of mm2 of sheet Historical Version s – view previous versions of standard. Therefore, the test should be performed under conditions of adequate ventilation.
Originally approved in For specific hazards statements see 5. 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.
For very small items, several pieces may have to be stripped to obtain the minimum area. 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. 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 speci? 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. Link to Active This link will always route to the current Active version of the standard. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Alternatively, for specimens of uniform thickness of base metal, such as a piece of plate or pipe, atsm the average thickness of the stripped specimen to the nearest 0. See Table 1 for a statistical summary of the test results. Permission rights to photocopy the standard may also be secured from the ASTM website www. This standard has been approved for use by agencies of the Department of Defense. 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 astk.
Mixing must be done by slowly adding sulfuric acid to water due to the heat generated and possible aatm. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? 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.
After stripping, wash the specimens by scrubbing them under running water, dip s90 hot water, and wipe or blow dry. Determine the weight [mass] of the specimens again, to the same precision as in the initial determination. 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. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
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.
SR means the standard deviation for R reproducibility. If specimens were prepared to the dimensions as provided in Note 2, they shall be presumed to have an area of 5. The specimen of wire may be of any length over 12 in.
ASTM A90/A90M – 13(2018)
Coating weights [masses] on all zinc-coated articles other than sheets are expressed in weight [mass] per unit area of surface. 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. Precision and Bias A number in parentheses indicates the year of last reapproval.
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. A coating of zinc on iron or steel articles provides protection against corrosion.
ASTM A90 – ZINC PLATING WEIGHT ON STEEL
A coating of zinc on iron or steel articles provides protection against corrosion. The same solution may be used repeatedly until the time required for stripping becomes inconveniently long.
No further reproductions authorized. Under no circumstances should the water be added to the acid. Your comments z90 invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Astn mixing should be performed under an acid fume hood.
Except as otherwise provided, the specimens should have a minimum area of 3 in.
In the body of this test method, reference to zinc coating shall be interpreted to also include zinc alloy coating except where speci?