ASTM E1659-12 Method for Coating Mass and Chemical Analysis of Zinc-Nickel Alloy Electrolytically Coated on Steel Sheet
ASTM E1659-12 test method determines the chemical analysis on coating mass and zinc-nickel alloy electrolytically coated on Steel Sheet. These test methods must be applied twice, once to each side of the specimen if coating mass and composition to both sides of a coated sheet is to be determined. Two separate specimens are required to perform the test.
ASTM E1659-12 test method covers independently the chemical analysis of each surface of zinc-nickel alloy electrolytically coated on a steel sheet. ASTM E1659-12 performs by two test procedure methods:-
1. A procedure for determining the independent mass of coating on each surface of zinc-nickel alloy-coated sheet steel, in coating masses from 20 to 45 g/m2 with a concentration range of 0.0 to 80 g/m2 of coating mass.
2. A procedure to determine nickel in zinc-nickel coatings with a concentration range of 7.0 to 17.0 % of nickel.
Mass Of Coating On Zinc-Nickel Alloy Coated Sheet By Weight-Strip-Weight Method
Nickel by the Atomic Absorption Method
Zinc-nickel alloy coated sheets in squares with sides of 50 ± 5 mm are used in the ASTM E1659-12 test method.
Calculate the mass of the zinc-nickel alloy coating in the ASTM E1659-12 test method as follows:
M = [(W1 – W2) – (E/1000)]
M = mass of stripped coating, g,
W1 = original mass of specimen, g,
W2 = weight of stripped specimen, g, and
E = iron stripped, mg.
Calculate the percent nickel as follows:
Nickel, % = 0.2N M
0.2 = constant with dimensions of gL/mg,
M = mass of stripped coating, g, from 18.1, and
N = nickel concentration read by the instrument, mg/L.
ASTM E1659-12 provides detailed information of chemical analysis for each surface of zinc-nickel alloy electrolytically coated on a steel sheet.
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