利用极化曲线和阻抗技术,对低碳钢在不同pH值H2S溶液中的腐蚀电化学行为进行了研究.结果表明,在溶液pH值较低时,腐蚀电极主要受阳极酸性溶解过程控制,表面无硫化物沉积,其阻抗谱除高频容抗弧外,低频有一感抗弧存在;随pH的升高,腐蚀电位明显负移,电流密度减小,表面出现硫化物的不连续沉积,腐蚀因溶液pH值的增加和硫化物的沉积而减小,电极过程主要受硫化物的生长所控制;在pH值为6.2时,由于HS 的阴极去极化,腐蚀电流增加;当pH大于7后,电极表面因氧化膜的生成而呈现钝化特征,极化电阻显著增加.基于溶液中HS 同OH 的竞争吸附,提出可能的腐蚀历程,据此可解释有关实验事实.
参考文献
| [1] | 刘小辉.茂名石化公司炼油厂加工进口原油的设备腐蚀与防护[J].石油化工腐蚀与防护,1994(04):56. |
| [2] | French E C.Corrosion and hydrogen blistering control in sour water system[J].Materials Performance,1978(03):20. |
| [3] | Humphries M J;Sorell G.Corrosion control in crude oil distillation units[J].Materials Performance,1976(02):13. |
| [4] | Baumann C;Scherrer C.Evalution of inhibitor for crude topping units[J].Materials Performance,1979(11):51. |
| [5] | Sardisco J B;Pitts R E .Corrosion of iron in an H2S-CO2-H2O system composition and protectiveness of the sulfide film as a function of pH[J].Corrosion,1965,21(08):350. |
| [6] | Gupta D V S .Corrosion behavior of 1040 carbon steel[J].Corrosion,1981,37:611. |
| [7] | Shoesmith D W;Taylor P;Balley M G;Owen D G .The formation of ferrous monosulfide polymorphs during the corrosion of iron by aqueous hydrogen sulfide at 21℃[J].Journal of the Electrochemical Society,1980,127(05):1007. |
| [8] | 杨怀玉,陈家坚,曹楚南,曹殿珍.H2S水溶液中的腐蚀与缓蚀作用机理的研究Ⅱ.碳钢在碱性H2S溶液中的阳极钝化及钝化膜破裂[J].中国腐蚀与防护学报,2000(01):8-14. |
| [9] | Morris D R;Sampaleanu L P;Veysey D N .The corrosion of steel by aqueous solutions of hydrogen sulfide[J].Journal of the Electrochemical Society,1980,127(06):1228. |
| [10] | 曹楚南.腐蚀电化学[M].北京:化学工业出版社,1994:104. |
| [11] | Huang H H;Tsai W T;Lee J T .Electrochemical behavior of A516 carbon steel in solutions containing hydrogen sulfide[J].Corrosion Science,1994,36(06):1027. |
| [12] | Iofa Z A;Batrakov V V;Cho-Ngok-Ba .Influence of anion adsorption on the action of inhibitors on the acid corrosion of iron and cobalt[J].Electrochimica Acta,1964,9:1645. |
| [13] | Shoesmith D W;Taylor P;Bailey MG;Ikeda B .Electrochemical behavior of iron in alkaline sulphide solutions[J].Electrochimica Acta,1978,23:903. |
| [14] | Shoesmith D W;Bailey M G;Ikeda B .Electrochemical formation of mackinawite in alkaline sulphide solutions[J].Electrochimica Acta,1978,23:1329. |
| [15] | Salvarezza R C;Videla H A;Arvia A J .The electrodissolution and passivation of mild steel in alkaline sulphide solutions[J].Corrosion Science,1982,22(09):815. |
| [16] | Salvarezza R C;Videla H A;Arvia A J .The electrodissolution behavior of mild steel in phosphate-borate-sulphide solutions[J].Corrosion Science,1983,23(07):717. |
| [17] | Geana D;Miligy A A EI;Lorenz W J .Electrochemical behavior of iron in alkaline sulphate solutions[J].Journal of Applied Electrochemistry,1974,4:337. |
| [18] | Smithm J S;Miller J D A .Nature of sulphides and their corrosive effect on ferrous metals:A Reveiew[J].British Corrosion Journal,1975,10(03):136. |
| [19] | Vera J;Kapusta S;Hackerman N .Localized corrosion of iron in alkaline sulfide solutions[J].Journal of the Electrochemical Society,1986,133(03):461. |
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