| GUO Chao,LI Ming,SHEN Quan-feng,TIAN Biao,GAO Shan.Corrosion Analysis of Water Facilities Pittings in Sahara Desert[J],45(7):51-55 |
| Corrosion Analysis of Water Facilities Pittings in Sahara Desert |
| Revised:July 20, 2016 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2016.07.009 |
| KeyWord:Sahara desert underground water stainless steel water facility pitting chloride ion |
| Author | Institution |
| GUO Chao |
China Petroleum Engineering and Construction Corporation, Beijing , China |
| LI Ming |
China Petroleum Engineering and Construction Corporation, Beijing , China |
| SHEN Quan-feng |
China Petroleum Engineering and Construction Corporation, Beijing , China |
| TIAN Biao |
China Petroleum Engineering and Construction Corporation, Beijing , China |
| GAO Shan |
China Petroleum Engineering and Construction Corporation, Beijing , China |
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| Abstract: |
| Objective To figure out the reasons of stainless steel corrosion in a water transmission project in Sahara desert, and propose the solutions accordingly. Methods field investigation was performed by corrosion appearance observation on pipings, filters, expansion joints and heat exchangers, raw water, corrosion samples and corrosion products were collected and analyzed in laboratory. Tafel curves of DIN 1.4301 stainless steel were tested in raw water with different temperatures, and analyzed 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 electrochemical 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 pittings 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. |
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