含Cl-,SO42-溶液中X70管線鋼縫隙的陰極極化行為

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含Cl^-,SO₄^2-溶液中X70管線鋼縫隙的陰極極化行為

基金項目:

No50499333)

國家自然科學基金資助項目(No.50301003

1. Corrosion and Protection Center, Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China;
2. Materials Science and Engineering School, Inner Mongolia University of Science and Technology, Baotou 014010, China;
3. Corrosion Erosion and Surface Technology Key Laboratory Beijing, Beijing 100083, China

摘要: 研究了X70管線鋼縫隙在含Cl^-、SO₄^2-溶液中陰極極化行為.實驗結果表明:在-1000mV(CSE)縫口控電位下,隨著縫隙開口尺寸增大,縫隙尖端越靠近縫口控電位;在同一縫隙開口尺寸時,隨著縫口控電位的增大,縫隙內越容易達到保護狀態.欠保護狀態下,縫隙腐蝕會發生,縫隙內溶液pH值降低;保護狀態下,縫隙內溶液pH值升高有堿化趨勢.
- X70管線鋼 /
- 氯離子 /
- 硫酸根離子 /
- 陰極保護
Abstract: Cathodic polarization behavior of an X70 pipeline steel crevice in solution containing Cl^- and SO₄^2- was studied. Experimental results show that at a protection potential of -1000 mV vs CSE, with increasing crevice size the potential of the crevice tip is close to the protection potential; at the same crevice size, with the increase of protection potential the status of protection is easily reached in the crevice. Under unprotection condition, crevice corrosion can happen and the pH value of solution reduces in the crevice; under protection condition, the pH of solution can rise and in the crevice the solution alkalized.
- X70 pipeline steel /
- chlorion /
- sulphate ion /
- cathodic protection