Characterization of blasted austenitic stainless steel and its corrosion resistance |
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Authors: | F Otsubo K Kishitake T Akiyama T Terasaki |
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Affiliation: | (1) Department of Materials Science and Engineering, Faculty of Engineering, Kyushu Institute of Technology, 1-1 Sensui Tobata Kita-Kyushu, 804-8550, Japan |
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Abstract: | It is known that the corrosion resistance of stainless steel is deteriorated by blasting, but the reason for this deterioration
is not clear. A blasted austenitic stainless steel plate (JIS-SUS304) has been characterized with comparison to the scraped
and non-blasted specimens. The surface roughness of the blasted specimen is larger than that of materials finished with #180
paper. A martensite phase is formed in the surface layer of both blasted and scraped specimens. Compressive residual stress
is generated in the blasted specimen and the maximum residual stress is formed at 50–100 μm from the surface. The corrosion
potentials of the blasted specimen and subsequently solution treated specimen are lower than that of the non-blasted specimen.
The passivation current densities of the blasted specimens are higher those of the non-blasted specimen. The blasted specimen
and the subsequently solution treated specimen exhibit rust in 5% sodium chloride (NaCl) solution, while the non-blasted specimen
and ground specimen do not rust in the solution. It is concluded that the deterioration of corrosion resistance of austenitic
stainless steel through blasting is caused by the roughed morphology of the surface. |
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Keywords: | austenitic stainless steel blasting corrosion resistance martensite phase residual stress surface roughness |
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