Color and anti-tarnish performance of rose gold film deposited by magnetron sputtering
[Introduction]Rose gold is widely used for decorative coating due to its elegant and romantic color. However,most of rose gold films are prepared by electroplating,which has serious environmental pollution problem. It is necessary to seek an environmental-friendly process to produce rose gold coatings.[Method]Au85 rose gold film was deposited on the surface of 316L stainless steel by magnetron sputtering. The effects of sputtering time,target current,and surface state of substrate on the film color were studied. The anti-tarnish performance of the rose gold film deposited under the optimized conditions was tested.[Result]Variation in sputtering time within 30 min had no significant effect on film color. An increase in target current from 0.5 to 1.0 A led to an increase in grain size,a decrease in brightness,and an increase in chroma. The surface state of substrate had an impact on the film color and the color difference along different directions. A bright red film could be deposited on the mirror-polished 316L stainless steel by magnetron sputtering at a target current of 1.0 A for 15 min. The film demonstrated a favorable anti-tarnish performance in both simulated sunlight exposure testing and artificial sweat immersion testing.[Conclusion]The magnetron sputtering of Au85 rose gold film meets the requirements of environmental protection and craft jewelry surface decoration,having a good application prospect.
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