|
|
|
| THE EFFECTIVE OXIDATION STATE OF VANADATE CORROSION INHIBITOR AND ITS RATE-DETERMINING STEP IN THE PASSIVATION PROCESS OF METALS |
| Zhou Bensheng Li Guohua (Nanjing Institute of Chemical Technology) |
|
|
|
|
Abstract The effective oxidation state of vanadate corrosion inhibitor is determined by rotating disk electrode(RDE)potentiometric titration using NaVO_3 and/or VOSO_4 respectively in the following deaerated aqueous solutions:(1)stainless steel in 0.5MH_2 SO_4,(2)mild steel in CO_2-saturated 20% monoethanolamine solution,and (3)titanium alloy in 3.0MH_2 SO_4.It is found that NaYO_3,as a compound of pentapositive vanadium,can passivate these active-passive metals,but VOSO_4,as a compound of quadripositive vanadium,can not,so the effective oxidation state of vanadate corrosion inhibitor in aqueous solutions is+5,not +4.It is also found that as an oxidizing inhibitor,various compounds of pentapositive vanadium are equivalent in passivation process of metals. The variation of critical passivation concentration of NaVO_3 to ω~(-1,2)(ω-angular velocity of RDE) indicates that the passivation process of titanium alloy is determined by the diffusion rate of NaVO_3 in H_2 SO_4 solutions and one electron reduction to quadripositive vanadium takes place at the surface of titanium alloy.
|
|
Received: 25 February 1990
|
Cite this article:
Zhou Bensheng Li Guohua (Nanjing Institute of Chemical Technology). THE EFFECTIVE OXIDATION STATE OF VANADATE CORROSION INHIBITOR AND ITS RATE-DETERMINING STEP IN THE PASSIVATION PROCESS OF METALS. J Chin Soc Corr Pro, 1990, 10(1): 43-50.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1990/V10/I1/43
|
[1] Kostic,Z.S.;Ostjanac,I.B.,Proceedings of the 6th European Sympos ium on Corrosion Inhibitors(6SEIC),P.1171 Ann.Univ.Ferrara,Italy,1985
[2] 周本省,化工机械,5(1) ,70(1978)
[3] 王树春、李季、季炳成、崔振群,化肥工业,10(2) ,13(1983)
[4] 彭楚国,腐蚀与防护,(3) ,29(1984)
[5] Zhou Bensheng:Yang jinxin,Proceedings of the 6th European Symposium on Corrosion Inhibitors(6SEIC),p.397,Ann.Univ.Ferrara,Italy(1985)
[6] 周本省、杨静新,中国腐蚀与防护学报,6(3) ,197(1986)
[7] Bard,A.J.;Faulkner,L.R.,Electrochemical Methods,Fundamentals and Applications,John wiley & sons,New York(1980)
[8] [日]硫酸协会编辑委员会编,张(?)等译,硫酸手册,化学工业出版社(1982)
[9] 李国华,硕士研究生学位论文,南京化工学院(1987) |
| No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
