Corrosion behaviour of ruthenium laser surface alloyed austenitic stainless steel in sulphuric acid and sodium chloride solutions

被引：3
|
作者：
van der Merwe, J. W. [1 ,2 ]
Moyo, F. [1 ,2 ]
Phetla, E. M. [1 ]
机构：
[1] Univ Witwatersrand, Sch Chem & Met Engn, Johannesburg, South Africa
[2] Univ Witwatersrand, DST NRF Ctr Excellence Strong Mat, Johannesburg, South Africa
来源：
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION | 2017年 / 68卷 / 08期
基金：
新加坡国家研究基金会;
关键词：
austenitic stainless steel; laser surface alloying; ruthenium;
D O I：
10.1002/maco.201609343
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
AISI 304L stainless steel was laser surface alloyed with ruthenium enriched 304L powder using a continuous wave Nd:YAG laser. Corrosion performance of the surface alloys was studied in 1 M sulphuric acid and 3.5 wt% sodium chloride at 25, 35 and 45 degrees C using potentiodynamic polarisation. The results showed that the presence of ruthenium decreased corrosion rates in both solutions and inhibited pitting in sodium chloride. High temperatures were particularly detrimental to the corrosion resistance of the alloys in sodium chloride, but were surprisingly beneficial in sulphuric acid; inducing spontaneous passivity and reducing corrosion current density from 129 mu A/cm(2) at 25 degrees C to about 0.5 mu A/cm(2) at 45 degrees C.
引用
收藏
页码：815 / 823
页数：9
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