Scope:

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.

Test Procedure:

Methods	Section
Mass Of Coating On Zinc-Nickel Alloy Coated Sheet By Weight-Strip-Weight Method	10-20
Nickel by the Atomic Absorption Method	21-31

Test Specimen:

Zinc-nickel alloy coated sheets in squares with sides of 50 ± 5 mm are used in the ASTM E1659-12 test method.

Data:

Calculate the mass of the zinc-nickel alloy coating in the ASTM E1659-12 test method as follows:

M = [(W₁ – W₂) – (E/1000)] 

where:

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 

where:

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.

Conclusion:

ASTM E1659-12 provides detailed information of chemical analysis for each surface of zinc-nickel alloy electrolytically coated on a steel sheet.