304不锈钢小孔腐蚀发生与发展过程的研究

中国腐蚀与防护学报

1984, Vol. 4

Issue (4): 270-276

研究报告

本期目录 | 过刊浏览

304不锈钢小孔腐蚀发生与发展过程的研究

侯文涛;JeanVanMuylder;RenéWinand

中国科学院长春应用化学研究所;中国科学院长春应用化学研究所;比利时布鲁塞尔自由大学冶金电化学系;教授主任

A STUDY ON THE INITIATION AND THE PROPAGATION OF PITTING CORROSION FOR AISI 304 STAINLESS STEEL

Hou Wentao(Institute of Applied Chemistry; Academia Sinica; China) Jean Van Muylder and Rene Winand(Free University of Brussels; Belgium)

全文: PDF(561 KB)

摘要: 本文研究了AISI304不锈钢在25℃的1NH_2SO_4+0.5NNaCl溶液中,当电位正于击穿电位时发生小孔腐蚀的特征。用动电位扫描法测定孔蚀击穿电位时,发现击穿电位与扫描速度的立方根呈线性关系。当电位正于E_b时,给定电位下的孔密度起初随时间而增加,然而当电流密度达到10mA/cm~2时,它趋于一个稳态值,称之为稳定态孔密度(S.S.D.P.);小孔的最大深度的平均值随时间呈线性增加,而且其平均增长速度V_(dp)(mm/min)与(E-E_b)(mV)之间的关系为:logV_(dp)=-7.5+2.89log(E-E_b);电流密度J随时间t的变化在电位正于E_b时遵循下列方程式:logJ=a+blogt,电流密度低于和高于10mA/cm~2时,所得到的b值是不相同的,这可能反映了腐蚀过程有差别。基于所得结果,建议对不锈钢的砘化膜耐小孔腐蚀的性能可依据E_b值、给定电位下的S.S.D.P.,V_(dp)以及在给定的(E-E_b)时的斜率b值来作较全面的评估。

Abstract：The characteristics of pitting corrosion above breakdown potential E_b are studied for AISI 304 stainless steel in the solution of 1NH_2SO_4+0.5NNaCl at 25℃. In potentiodynamic study, a linear relationship between E_b and cubic root of potential scanning rate is found. The actual value of E_b is obtained by extrapolation of the scanning rate to zero. It is about +596mV(SHE) for given conditions. Results also show that, at constant potential above E_b, the pit density first increases with time and tends afterwards to a steady state density of pits (S. S. D. P.)which is reached at a current density of 10mA/cm~2. The average deepening spewed of pits Vdp(mm/min) increases with(E-E_b) (mV) according to the equation:logVdp=-7.5+2.89log(E-E_b) The time dependence of courrent density at constant potential above E_b follows the equation:logJ=a+blogt The values of slope b are different for current densities below and above 10mA/cm~2, confirming the change in corrosion processes. It is suggested that, the resistance of passivating layers to pitting corrosion can be evaluated by E_b as well as S. S. D. P., Vdp and b at a given value of (E-E_b).

收稿日期: 1984-08-25

	服务

	把本文推荐给朋友
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	侯文涛
	JeanVanMuylder
	RenéWinand
44.8K

引用本文:

侯文涛;JeanVanMuylder;RenéWinand. 304不锈钢小孔腐蚀发生与发展过程的研究[J]. 中国腐蚀与防护学报, 1984, 4(4): 270-276.
. A STUDY ON THE INITIATION AND THE PROPAGATION OF PITTING CORROSION FOR AISI 304 STAINLESS STEEL. J Chin Soc Corr Pro, 1984, 4(4): 270-276.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y1984/V4/I4/270

[1] Smialowska, S.; Czachor, M., Localized Corrosion(Proceeding on U. R. Evans Conference on Localized Corrosion), NACE-3, Williamsburg, Virginia, 6-10, Dec., 353(1971) , Editors: Staehle, R. W., et al.
[2] Broli, A.; Holton, H., Corrosion Science, 19, 59 (1977)
[3] Dayal, R. K.; Parvathavarthini, N.; Gnamamoorthy, J. B., Corrosion, 36, 433(1980)
[4] Seys, A. A.; Van Haute, A. A., Corrosion, 29, 1056(1973)
[5] Syrett, B. C., Corrosion, 33, 221 (1977)
[6] Lizlovs, E. A.; Bond, A. P.; Corrosion, 31, 219(1975)
[7] Morris, P. E.; Scarberry, R. C., Corrosion, 28, 44(1972)
[8] Truman, J. E., Stainless steel Industry, 6, 21 (1978)
[9] Man, H. C.; Gabe, D. R., Corrosion Science, 21, 323(1981)
[10] Horst, R. L.; English, G. C., Materials Performance 19, 13(1980)
[11] 杨武;徐克熏;腐蚀与防护,1,1,42～45(1981)
[12] Engell, H. J.; Stolica, N. D., Z. F., Phys. Chem., N. F., 20, 113(1959)

No related articles found!

Viewed

Full text

Abstract

Cited

Shared

Discussed