Abstract
The colored films were successfully prepared on the 304 stainless steel surfaces in coloring solutions with different NiSO4 contents. The purpose of this study was to investigate the effects of NiSO4 in the coloring solution on the coloring performance of 304 stainless steel and corrosion resistance of the obtained colored film in NaCl solution. The coloring rate was determined from coloring potential-time curve, and the protection properties of the color films in a 3.5% NaCl solution were characterized by potentiodynamic polarization scan, electrochemical impedance spectroscopy, and wear resistance test. The results showed that adding NiSO4 could accelerate the coloring process but brought about a negative impact on the surface’s corrosion resistance.
Highlights
Stainless steel is a common and highly corrosion-resistant material, which has been widely applied in many aspects of our daily life, such as kitchen utensils, household appliances, and automotive industries
Under the same friction time, the surface of stainless steel prepared decreased with the increasing of NiSO4 content in the coloring solution, which indicated that the by coloring experiment without NiSO4 is the most resistant to fretting, and the surface is the least addition of NiSO4 had a disadvantage for the wear resistance of the films
The effects of NiSO4 on the coloring rate and corrosion resistance of the colored film on 304 stainless steel surface produced by INCO methods were investigated
Summary
Stainless steel is a common and highly corrosion-resistant material, which has been widely applied in many aspects of our daily life, such as kitchen utensils, household appliances, and automotive industries. Green [8] of the European research and development center of Birmingham International Nickel company in 1927. They dipped stainless steel plates into CrO3 /H2 SO4 solution to create black stainless steel and obtained a patent. Batcheller successively proposed three patents which report the method of creating a series of colors such as black, dark blue, bronze, yellow, and chocolate on stainless steel surfaces in sulfuric acid and chromate solution. In 1965, N.E. Clegg and W.J. Greening found that adding a few ammonium molybdate into sulfuric acid and chromate solution can improve the glossiness of colored films on stainless steel. The above-mentioned studies provide numerous valuable basic research theories
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