The salt spray test predicted that cadmium plating can outperform zinc coating for auto parts Wrong! plating can be measured by salt spray hours. This method has two parts: 1. Thickness.
And that’s why we put them through our state-of-the-art salt fog chamber in accordance with ASTM B117. White corrosion products on external edges or corners shall not be cause for rejection. 100 Hours : 300 Hours Testing the Corrosion Resistance of Zinc Coatings. SPC offers a variety of industrial plating services that prevent rust, including a zinc-nickel plating process that’s a popular choice among automotive manufacturers because of its ability to prevent white and red rust from forming during salt spray testing (see Salt Spray testing below). PLATING SPECIFICATIONS - GENERAL INFORMATION Page 13 Reference Only April 2018 NICKEL QQ-N-290 Coating for steel, copper, copper alloys, zinc and zinc alloys. 100 Hours : 300 Hours To secure uniformity of results, age Types II, III, V, and VI supplementary coatings at room temperature for 24 h before subjection to the salt spray. Can be similar in color to
Thus hardness can range from 150-1500 Vickers. Clear. Salt Spray Hours : To White Rust: To Red Rust: 0.0002" Min. Xray, adhersion, salt spray testing and black zinc plating Testing – The parts shall be capable of passing a salt spray test per ASTM B117. Nickel can be deposited soft or hard, dull or bright, depending upon process used and conditions employed in plating.
This finish should not be used in marine or high salt spray environments. White Rust: Plain zinc coating will show signs of white rust within a few hours in a salt spray test. ASTM G85 Annex A1 – Acetic Acid Salt Spray Test (non-cyclic) This test can be used to determine the relative resistance to corrosion of decorative chromium plating on steel and zinc based die casting when exposed to an acetic acid salt spray climate at an elevated temperature. Many people consider the salt spray test to be a preliminary test to be followed by a more demanding test such as the CASS test (copper accelerated salt spray), ASTM B368-97. ABSTRACT: Zinc plating is the basic process of protective coating to protect the substrate from coating. Salt Spray Testing: this is the standardized test method used to check the corrosion resistance of coated samples. Usually, this test is carried out in line with the ASTM B117 or ISO 9227 testing procedure.
Call 260-925-1820 to learn more. 12 Hours: 24 Hours : Yellow. Chromate. Minimum salt spray requirements are 96 hours with no white corrosion products and 120 hours with no red rust on significant surfaces.
There are many discussions of the salt spray test in metal finishing literature.