硫酸根浓度对X70钢在卵石黄泥土中腐蚀行为的影响  

Influence of SO_4^(2-) Content on Corrosion Behavior of X70 Steel in Yellow Pebble Soil

作　　者：费小丹[1,2] 李明齐[2] 蔡铎昌[2] 

机构地区：[1]西南科技大学国防科技学院,绵阳621010 [2]西华师范大学化学化工学院,南充637002

出　　处：《腐蚀与防护》2009年第8期542-544,共3页Corrosion & Protection

基　　金：四川省科技厅重点资助项目(O4JY029-100)

摘　　要：利用极化曲线法、电化学阻抗法和扫描电镜研究了硫酸根浓度对X70钢在卵石黄泥土中腐蚀行为的影响。结果表明,在不同硫酸根浓度的卵石黄泥土中,随着硫酸根浓度的增大,X70钢的自腐蚀电位负移,自腐蚀电流密度增大。交流阻抗谱表现为叠加的双容抗弧,弧半径随硫酸根浓度的增大而减小。X70钢在加入0.5%硫酸根的土壤中发生较严重的坑点腐蚀。Influence of SO4^2- content on corrosion behavior of X70 steel in yellow pebble soil was studied by means of polarization curves, EIS and SEM. The results showed that with the increase of SO4^2- content, Ecorr shifted negatively and icorr increased. The Nyquist diagram was composed of two capacitive arcs. The radius of the are became smaller with the increase of SO4^2- content. X70 steel in soil with 0. 5% SO4^2- suffered severe pitting corrosion.

关 键 词：X70钢 卵石黄泥土 硫酸根 电化学阻抗谱 极化曲线 

分 类 号：TG172.4[金属学及工艺—金属表面处理]