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- Title
The electrochemical polishing behavior of duplex stainless steel(SAF 2205) in phosphoric-sulfuric mixed acids.
- Authors
Huang, C. A.; Hsu, C. C.
- Abstract
In this paper the electrochemical polishing behavior of duplex stainless steel (DSS) in phosphoric-sulfuric mixed acids with volume ratios of 1:1, 2:1, and 3:1 was studied. The electrochemical polishing was conducted at 70°C by using arotating disc electrode. Before the polishing, the steel specimens were heated at 1080°C for 10 min and cooled with different rates to obtain dissimilar microstructures. Experimental results show that a brightening surface of each DSS specimen can be obtained by polishing in the mixed acids at 70°C. However, the dissolution rate between α and γ phases in a DSS specimen is different during potentiostatic polishing inthe mixed acids and the rate of α phase is obviously higher than that of γ phase. However, the difference in the dissolution rate can be reduced as the DSS specimen was polished in a highH3PO4-content mixed acid. Some small round σ-phases were found to precipitate along the α/γ interface in a DSS specimen, which can be obtained by heating at 1080°C and then cooling in the furnace. The presentation of σ phase increased the hardness and microstructure fraction of the γ phase in the DSS specimen. Moreover, the σ phase can be leveled together with α and γ phases as polishing in the 3:1 v/v mixed acid.
- Subjects
GRINDING &; polishing; STAINLESS steel; HARDNESS testing; MECHANICAL properties of metals; ELECTROLYTIC polishing; METAL finishing
- Publication
International Journal of Advanced Manufacturing Technology, 2007, Vol 34, Issue 9/10, p904
- ISSN
0268-3768
- Publication type
Article
- DOI
10.1007/s00170-006-0654-8