Galvanic corrosion on vacuum-brazed UNS S31803 duplex stainless steel using Ni-Cr-Fe-P alloy filler metals

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题名:	Galvanic corrosion on vacuum-brazed UNS S31803 duplex stainless steel using Ni-Cr-Fe-P alloy filler metals
作者:	Chiu, L. H. Wu, C. H. Chang, H.)
贡献者:	機械系
关键词:	duplex stainless steel galvanic corrosion;immersion. test Ni-Cr-Fe-P brazing filler shear strength
日期:	2007
上传时间:	2009-11-16 10:58:32 (UTC+8)
摘要:	The galvanic corrosion behavior of Ni-Cr-Fe-P fillers and vacuum-brazed UNS S31803 duplex stainless steel (DSS) in a galvanic couple has been investigated. The Ni-Cr-Fe-P fillers were made from mechanical alloying iron and chromium into the BNi-7 filler in a mixer/miller for 3 h. By varying the amount of Fe and Cr powders added into the BNi-7 filler, the filler compositions were adapted to reduce the galvanic effects between the filler metal and the UNS S31803 DSS substrate. The galvanic corrosion behavior was studied using galvanic current measurements and weight-loss measurements. The experimental result showed that, coupled with Ni-22.4Cr-6.7P-20Fe filler, the UNS S31803 DSS brazed joint exhibited a very low nominal current density in a 3.5% sodium chloride (NaCl) solution. From the immersion test, it was also found that the brazed joint using Ni-22.4Cr-6.7P-20Fe filler had the lowest weight loss among all specimens. By adapting the filler composition to UNS S31803 DSS, the effect of galvanic corrosion on the vacuum-brazed joint could be substantially reduced and an increase in the vacuum-brazed joint shear strength was observed.
關聯:	CORROSION Volume: 63 Issue: 2 Pages: 127-134
显示于类别:	[機械工程系暨機械工程學系數位機電研究所] 期刊論文

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