表面技术2016，Vol.45Issue(7)：51-55,5.DOI:10.16490/j.cnki.issn.1001-3660.2016.07.009
撒哈拉地区不锈钢输水设施点蚀原因分析
Corrosion Analysis of Water Facilities Pittings in Sahara Desert
摘要
Abstract
ABSTRACT:Objective To figure out the reasons of stainless steel corrosion in a water transmission project in Sahara desert, and propose the solutions accordingly.Methodsfield investigation was performed by corrosion appearance observation on pip-ings, filters, expansion joints and heat exchangers, raw water, corrosion samples and corrosion products were collected and ana-lyzed in laboratory. Tafel curves of DIN 1.4301 stainless steel were tested in raw water with different temperatures, and ana-lyzed with Rp simulation.Results pittings were found in girth welds bottom of the pipings, more pittings were found in pipings with higher temperature. Mineralization and chloride ions content were 1947 mg/L and 600 mg/L respectively in the raw water, the RI value in ambient is 7.7, which was corrosive. PREN values of the stainless steel used in this project is low. The electro-chemical tests showed that DIN 1.4301 was corrosion resistance in raw water in 20℃, but not suitable to serve in a temperature higher than 40℃. Therefore the high temperature and shut down process deteriorated the situation.Conclusion reasons of pit- tings in this project include corrosive water quality, materials which are sensitive to pitting, and the high temperature caused by shut down process and sunshine. Solutions of corrosion protection include water purification, change materials with high pitting resistance, internal coating protection, reducing the effects by high temperature and shut down progress, etc.关键词
撒哈拉地区/地下水/不锈钢/输水设施/点蚀/氯离子Key words
Sahara desert/underground water/stainless steel/water facility/pitting/chloride ion分类
矿业与冶金引用本文复制引用
郭超,李明,沈全锋,田彪,高山..撒哈拉地区不锈钢输水设施点蚀原因分析[J].表面技术,2016,45(7):51-55,5.基金项目
中石油集团公司工程建设板块项目（2012GJTC-01-07-02） FundSuported by China National Petroleum Corporation (2012GJTC-01-07-02) （2012GJTC-01-07-02）
