摘要
为了揭示接地网材20钢在砂质土壤中的腐蚀行为与Cl-的关系,以宁夏地区砂质土壤为腐蚀介质,利用土壤埋片试验、电化学试验研究了20钢在不同Cl-浓度砂质土壤中的腐蚀形为;用扫描电镜、X射线衍射仪对腐蚀产物形态和成分进行了表征分析。结果表明:砂质土壤中Cl-含量对20钢的腐蚀过程有较大的影响,腐蚀速率随着Cl-浓度的升高而先增后减,当Cl-浓度为1.5%时,腐蚀速率达到最大值;Cl-在腐蚀过程中起催化作用,促进金属的溶解,Cl-浓度为1.5%时,20钢表面腐蚀产物主要有Fe2O3和FeOOH,形成近阵列的结构,良好地覆盖在基体上,对腐蚀起到了一定的阻碍作用。
The sandy soil containing different concentration of Clin Ningxia area was used as the corrosive medium to investigate the corrosion behavior of grounding grid 20 steel( 20G steel) via soil-bearing test and electrochemical test. The appearance and composition of the corroded products were analyzed by means of scanning electron microscopy and X-ray diffraction,and the relationship between the corrosion behavior of the steel and Cl-content in the sandy soil was explored. It was found that the content of Cl-in the sandy soil had significant effect on the corrosion of the steel. Namely,the corrosion rate of the steel initially rose but declined later with increasing Cl-concentration in the sandy soil, and the maximum corrosion rate was recorded at a Cl-concentration of 1. 5%( mass fraction). This was because Cl-acted to catalyze the corrosion of the steel and accelerate its dissolution. Particularly,at a Cl-concentration of 1. 5%,the corroded products on the surface of the steel mainly consisted of Fe 2 O 3 and FeOOH, and the corroded products were aligned nearly as arrays on the steel surface to well cover it and effectively prevented it from corrosion.
出处
《材料保护》
CAS
CSCD
北大核心
2013年第9期57-60,8,共4页
Materials Protection
基金
国家电网江西省电力公司科技项目(201250606)
湖南省自然科学基金项目(09JJ6067)资助
关键词
腐蚀行为
Cl-
砂质土壤
接地网
20钢
电化学性能
corrosion behavior
chloride ion
sandy soil
grounding grid
20 steel
electrochemical performance
作者简介
[通信作者]朱志平（1963-），博士，教授，主要从事电力设备的腐蚀与防护研究，电话：13808475420，E-mail：zzp8389@163．com
