1993 Volume 42 Issue 4 Pages 219-224
Investigation has been made on the corrosion resistance of stainless steels which were polished by abrasive belt-grinding using various kinds of polishing oils. Stainless steel sheets of SUS 430, SUS 430 LX, SUS 444, SUS 304 and SUS 316 were polished using a belt grinding machine which was equipped by abrasive endless belts smeared with ten kinds of mineral oils. Corrosion resistance of the polished stainless steels was examined by salt spray test, atmospheric exposure test and pitting potential measurement. The results are summarized as follows: Sulfur or its compounds which are added to the polishing oils in order to improve the abrasive belt grinding performance have harmful effects for the corrosion resistance of the stainless steels. On the other hand, other additives, i. e., phosphorus or chlorine compounds and oleic acid are almost harmless. Surface analysis of the polished stainless steels by XPS (X-ray photoelectron spectroscopy) showed that the surface oxide layer formed by the belt grinding, using the sulfurized mineral oil, contained much sulfides which caused the deterioration of the corrosion resistance of stainless steels.
