2205與15MnNiCrMoV異質(zhì)鋼焊接接頭的耐蝕性能

Corrosion Resistance of Dissimilar Steel Welding Joint of 2205 and 15MnNiCrMoV

雙相不銹鋼2205與低碳合金調(diào)質(zhì)高強(qiáng)鋼15MnNiCrMoV復(fù)合板焊接接頭,35 ℃下, 在質(zhì)量分?jǐn)?shù)為10%的HCl和H2SO4腐蝕溶液中, 對(duì)其腐蝕產(chǎn)物進(jìn)行了分析, 結(jié)果表明, 復(fù)合板焊接接頭在HCl溶液中的耐蝕性較差, 且熱影響區(qū)的腐蝕程度均比焊縫處的嚴(yán)重; 在H2SO4溶液中, 焊接接頭15MnNiCrMoV側(cè)的腐蝕比在相同條件下的HCl中嚴(yán)重, 尤其是熱影響區(qū)對(duì)H2SO4的耐蝕性較差, 而焊接接頭雙相不銹鋼2205側(cè)在H2SO4溶液中未發(fā)生腐蝕。其原因主要是在雙相不銹鋼表面形成了鈍化型的Cr2O3、FeO、Cr-O等氧化物膜層。
Using the method of steel component analysis and metallographic analysis, the corrosion products of welding joint of duplex stainless steel 2205 and low carbon alloy 15MnNiCrMoV immersed in HCl and H2SO4 solution (10%,mass fraction) at 35 ℃ were studied. The results show that the corrosion resistance of welding joint was poor in the HCl solution, and corrosion resistance of the heat affected zone was poorer than that of weld area. The corrosion of welding joint of 15MnNiCrMoV side was more serious in the H2SO4 solution, especially with its heat affected zone. However, the welding joint compound did not have any corrosion in the side of duplex stainless steel 2205, due to the form ation of passivation films, such as Cr2O3, FeO and Cr-O on the surface of duplex stainless steel 2205, which can prevent corrosion.

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