Abstract
This study used cathodic arc deposition technique to coat TiN film on 316L austenitic stainless steel, and then the coated specimens were heat-treated at the different temperatures. Observation of coating morphology and corrosion tests were conducted for exploring the effect of post-heating temperature on composition, microstructure, and corrosion behavior of the coatings. The results showed when the heating temperature was up to the range of 500-600 oC, a Ti-N-O mixed film consisting of the two TiO2 and TiN phases was formed on the outer layer. Particular, the film heated at 500 oC had a dense structure as well as homogeneous chemical composition. Such the result could effectively inhibit pitting corrosion of 316L stainless steel in 3.5 wt% NaCl and 10 vol% HCl solutions.
Highlights
This study used cathodic arc deposition technique to coat titanium nitride (TiN) film on 316L austenitic stainless steel, and the coated specimens were heat-treated at the different temperatures
Physical vapor deposition (PVD) technology has become a popular method of surface treatment for several decades, because this method allows at low processing temperatures to deposit ceramic coatings on metallic substrates [6]
After post-heating of 400 oC for 2 h, the TiN film almost had no variation in morphology (Figure 1b)
Summary
It is well known that stainless steels process well corrosion resistance, oxidation resistance and formability, particular austenitic stainless steels, which have been widely used in various engineering applications and high quality goods, such as surgery instruments, artificial joints, and precision watches [1] Despite these advantages, the steels still have some shortcomings, such as low hardness and pitting corrosion in chlorine environment [2,3,4,5]. Titanium nitride (TiN) has an intrinsic golden color, and exhibits high hardness, good thermal and electrical conductivity Such the attractive properties, TiN becomes an important film material in engineering applications [12]. Thereby, the purpose in the study is to coat TiN films on austenitic stainless steel by CAD method along with post heat treatment at different temperatures. The corrosion tests were carried out to evaluate the effect of post-heating temperature on the corrosion behavior of the coated specimens
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