两种热处理工艺对2205双相不锈钢腐蚀行为的影响

详细信息

Effect of Two Kinds of Heat Treatment on Corrosion Behavior of 2205 Duplex Stainless Steel

摘要: 采用动电位极化曲线、显微形貌观察的方法研究了两种热处理工艺对2205不锈钢在高Cl-环境中的腐蚀行为。通过金相组织分析观察热处理后样品的组织形貌, 在此基础上建立了显微组织与腐蚀行为之间的相关性。结果表明, 950 ℃热处理+炉冷处理导致2205双相不锈钢中σ相大量析出, 造成σ相周围铬和钼含量的减少, 从而使双相不锈钢的耐腐蚀性能显著降低。
- 2205不锈钢 /
- 腐蚀规律 /
- 热处理
Abstract: The effect of two kinds of heat treatment on the corrosion behavior of 2205 duplex stainless steel was investigated by means of polarization curves, immersion testing and morphology observation. The experiment results indicated that the heat treatment at 950 ℃ for 30 min followed by furnace cooling decreased the corrosion resistance of 2205 duplex stainless steel significantly, which was attributed to the formation of Cr23C6 and σ phase.
- 2205 duplex stainless steel /
- corrosion rule /
- heat treatment

[1]	Muthupandi V, Bala Srinivasan P, Seshadri S K, et al. Effect of weld metal chemistry and heat input on the structure and properties of duplex stainless steel welds[J]. Mater Sci, 2003, 358:9-16.
[2]	Dobranszky J, Szabo P J, Berecz T, et al. Energy-dispersive spectroscopy and electron backscatter diffraction analysis of isothermally aged SAF 2507 type superduplex stainless steel[J]. Spectrochim Acta, 2004, B59:1781-1788.
[3]	Nilsson J O, Wilson A. Inuence of isothermal phase transformation on toughness and pitting corrosion of super duplex stainless steel SAF 2507[J]. Mater Sci Technol, 1993, 9(7):545-554.
[4]	Angelini E, Benedetti B D, Maizza G, et al. Sensitization phenomena on aged SAF2205 duplex stainless steel and their control by means of EPR tests[J]. Corrosion, 1999, 55(6):605-615.
[5]	Tavares S S M, Terra V F. Corrosion resistance evaluation of the UNS S31803 duplex stainless steels aged at low temperatures (350 to 550 ℃) using DLEPR tests[J]. J Mater Sci, 2005, 40(15):4025-4028.
[6]	Park C J, Rao V S, Kwon H S. Effect of sigma phase on the initiation and propagation of pitting corrosion of duplex stainless steel[J]. Corrosion, 2005, 61:76-83.
[7]	Adhe K N, Kain V, Madangopal K, et al. Inuence of sigma-phase formation on the localized corrosion behaviour of a duplex stainless steel[J]. J Mater Eng Perform, 1996, 5:500-506.