硝酸処理によるベルト研磨ステンレス鋼の耐食性改善 [in Japanese] Improvement of the Corrosion Resistance of the Belt-ground Stainless Steels by Nitric Acid Treatment [in Japanese]
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The effects of immersion or electrolysis in nitric acid solutions on the corrosion resistance of stainless steels ground using an abrasive belt and polishing oil were studied by immersing plate specimens of SUS 430, SUS 430LX, and SUS 304 belt-ground using a sulfurized mineral oil in 5∼30mass % HNO<sub>3</sub> for 60min or by electrolyzing them in 10mass % HNO<sub>3</sub> for 8-16s at 50 or 60°C. Corrosion resistance of samples was evaluated by a modified ferroxyl test and salt spraying followed by drying and wetting (SDW) rusting tests. We found that immersion in 10-20mass % HNO<sub>3</sub> was more effective than that in 30mass % HNO<sub>3</sub> and that cathodic or alternating electrolysis was more effective than anodic electrolysis in improving corrosion resistance of samples. XPS showed that effective immersion and effective electrolysis in nitric acid solution decreased sulfur content in the surface film. Corrosion resistance is presumed improved by repassivation after dissolution of the original surface film containing sulfur in nitric acid solution.
- Jitsumu Hyomen Gijutsu
Jitsumu Hyomen Gijutsu 49(8), 881-886, 1998-08-01
The Surface Finishing Society of Japan