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The electrochemical polishing behavior of duplex stainless steel(SAF 2205) in phosphoric-sulfuric mixed acids

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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.

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Authors and Affiliations

  1. Department Mechanical Engineering, Chang Gung University, Taoyuan, Gweishan, Taiwan, Republic of China

    C. A. Huang & C. C. Hsu

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  1. C. A. Huang
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  2. C. C. Hsu
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Correspondence to C. A. Huang.

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Huang, C.A., Hsu, C.C. The electrochemical polishing behavior of duplex stainless steel(SAF 2205) in phosphoric-sulfuric mixed acids. Int J Adv Manuf Technol 34, 904–910 (2007). https://doi.org/10.1007/s00170-006-0654-8

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  • DOI: https://doi.org/10.1007/s00170-006-0654-8

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