孔蚀发展过程动力学分析

中国腐蚀与防护学报

1998, Vol. 18

Issue (4): 241-250

研究报告

本期目录 | 过刊浏览

孔蚀发展过程动力学分析

唐子龙

天津大学材料系;天津300072

KINETIC ANALYSIS ON PITTING GROWTH

TANG Zi-long (Dept. Materials; Tianjing University; Tianjin 300072)

全文: PDF(788 KB)

摘要: 根据物质守恒、电荷守恒关系和电化学动力学,对球形、柱形蚀孔且其孔内存在和不存在沉积层,共四种典型状态下蚀孔的发展过程进行动力学分析,得到孔蚀电流、蚀孔深度和孔径随时间的变化关系。结果表明:孔蚀电流随时间发展共有四种特征函数,t~(1/2)、t、t~2和t~*ln(t),每一函数均对应特定的蚀孔发展状态.此四种函数构成一般蚀孔电流随时间关系的基集合,线性组合后得到普遍性孔蚀发展动力学方程。详细讨论了孔蚀发展与诸影响因素的关系,孔内沉积层存在与否及性能如何对蚀孔发展有显著影响,对球形孔的影响大于对柱形蚀孔。进而分析缓蚀剂抑制孔蚀发展的可能途径和效果,确定了孔蚀发展缓蚀剂须具备的条件;模型的正确性得到三方面结果的证实:实测304不锈钢在NaCl介质中孔蚀发展过程的电流关系,由建立的动力学方程给予了很好的解释。模型得到的孔蚀电流增长的最大方式是时间二次方,最小方式是平方根,与大量的文献结果吻合。孔蚀深度随时间仅有两种变化关系,幂函数和指数函数,与孔蚀深度的统计研究结果一致。

关键词 ：孔蚀, 动力学, 缓蚀作用

Abstract：On the basis of law of conservation of mass and charge and electrochemical kinetics of corrosion, a kinetic analysis has been performed on self-propagation process of pits under four typical conditions, i.e. hemispherical and cylindrical pits in the presence and absence of precipitation layer inside the pit. The time dependence of pitting current, depth and radius for the four kinds of pit was obtained. The summarized results demonstrate that the dependence of pitting current on time comply with four functions of time, that are t1/2, t, t2 and t*ln(t), and each of them corresponds to a specific pattern of pitting growth. Furthermore, a general equation describing pitting current increasing with time has been put forward by linearly combining these extracted time functions. The resistance of participation layer plays an important role in pitting growth more obviously on hemispherical pits than on cylindrical pits. The possible ways to retard pitting growth by inhibitor and the necessary requirements for inhibitor were discussed. The kinetic equation established was validated from three aspects. The variation of pitting current with time for 304 stainless steel in NaCl solution under potential control can be explained well according to the equation. Second, the maximum increase of pitting current is the square of time and the minimum is square root. This result is confirmed by a great amount of previous studies. Finally, pit depth varies with time only as a function of power or logarithm. This is consistent with statistical analysis of pit depth data.

Key words： Pitting Growth Kinetics Inhibition

收稿日期: 1998-08-25

基金资助:国家自然科学基金项目;;金属腐蚀与防护国家重点实验室项目

	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
	唐子龙
44.8K

引用本文:

唐子龙. 孔蚀发展过程动力学分析[J]. 中国腐蚀与防护学报, 1998, 18(4): 241-250.
. KINETIC ANALYSIS ON PITTING GROWTH. J Chin Soc Corr Pro, 1998, 18(4): 241-250.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y1998/V18/I4/241

1 Smialowska Z. Pitting Corrosion of metals, Houston TX, NACE, 1986. 113
2 Nishimura R, Kudo K. Corrosion, 1988, 44(1): 29
3 Hunkeler F, Bohni H. Corrosion, 1984, 40:53
4 Newman R C, Franz E M. Corrosion, 1984, 40:325
5 Provan J W, Rodrigue E S. Corrosion, 1989, 45(3): 178
6 Laycock P J, Cottis R A, Scarf P A. J. Electrochem. Soc., 1990, 137(1): 64
7 Scarf P A, Cottis R A, Laycock P J. J. Electrochem. Soc., 1992, 139(2): 262
8 Sheikh A K, Boah I K, Hansen D A. Corrosion, 1990, 46(3): 190
9 Marsh G P, Bland I D, Taylor K J. Br. Corros. J., 1988, 23(3): 157
10 Turnbull A, Ferris D H. Corrosion Sci., 1987, 27(12): 1323
11 Verbrugge M W, Baker D R, Newman J. Electrochemica Acta, 1993, 38(12): 1649
12 Mankowski J, Simalowska Z S. Corrosion Science, 1975, 15:493
13 Strehblow H H, Wenners J. Zeits. Phys. Chem. Neue Folge, Bd. 1975, 98:199
14 Smialowska Z. Pitting Corrosion of metals, Houston TX, NACE, 1986. 127
15 唐子龙,宋诗哲.中国腐蚀与防护学报,1996,16(2):94
16 唐子龙,宋诗哲.中国腐蚀与防护学报,1993,13(4):341
17 Tang Z L, Song S Z. Corrosion Science, 1993, 34(10): 1607
18 宋诗哲,唐子龙.腐蚀科学与防护技术,1992,4(3):150
19 Popov Yu A, Alekseev Yu V. Soviet Electrochemisty, 1987, 23(1):71

[1]	张晨, 陆原, 赵景茂. CO₂/H₂S腐蚀体系中咪唑啉季铵盐与3种阳离子表面活性剂间的缓蚀协同效应[J]. 中国腐蚀与防护学报, 2020, 40(3): 237-243.
[2]	吕祥鸿,张晔,闫亚丽,侯娟,李健,王晨. 两种新型曼尼希碱缓蚀剂的性能及吸附行为研究[J]. 中国腐蚀与防护学报, 2020, 40(1): 31-37.
[3]	王帅星,杜楠,刘道新,肖金华,邓丹萍. X80钢在酸性红壤模拟液及室外红壤中的腐蚀动力学规律及相关性分析[J]. 中国腐蚀与防护学报, 2019, 39(1): 18-28.
[4]	刘峥, 李海莹, 王浩, 赵永, 谢思维, 张淑芬. 分子动力学模拟水溶液中席夫碱基表面活性剂在Zn表面的吸附行为[J]. 中国腐蚀与防护学报, 2018, 38(4): 381-390.
[5]	王海媛, 卫英慧, 杜华云, 刘宝胜, 郭春丽, 侯利锋. 绿色缓蚀剂SDDTC对AZ31B镁合金的缓蚀作用及吸附行为[J]. 中国腐蚀与防护学报, 2018, 38(1): 62-67.
[6]	曹发和, 柳晓燕, 朱泽洁, 叶珍妮, 刘盼, 张鉴清. 扫描电化学显微镜的数值模拟和距离控制及其应用[J]. 中国腐蚀与防护学报, 2017, 37(5): 395-401.
[7]	戴芸,刘胜胆,邓运来,张新明. 7020铝合金在3.5%NaCl溶液中的点蚀行为[J]. 中国腐蚀与防护学报, 2017, 37(3): 279-286.
[8]	艾莹珺,杜楠,赵晴,黄世新,王力强,文庆杰. 温度对304不锈钢亚稳蚀孔萌生和稳态蚀孔几何特征的影响[J]. 中国腐蚀与防护学报, 2017, 37(2): 135-141.
[9]	赵景茂,赵起锋,姜瑞景. 咪唑啉缓蚀剂在CO₂/H₂S共存体系中的构效关系研究[J]. 中国腐蚀与防护学报, 2017, 37(2): 142-147.
[10]	林晓冬,彭群家,韩恩厚,柯伟. 核级不锈钢的热老化研究进展[J]. 中国腐蚀与防护学报, 2017, 37(2): 81-92.
[11]	李阳恒,左禹,唐聿明,赵旭辉. 应变作用下Q235碳钢在NaHCO₃+NaCl溶液中的孔蚀行为[J]. 中国腐蚀与防护学报, 2016, 36(3): 238-244.
[12]	闫涛,宋振纶,杨丽景,肖涛,侯利锋. 新喀里多尼亚弧菌对Cu在人工海水中腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2016, 36(2): 157-164.
[13]	赵景茂,赵雄,姜瑞景. 在动态H₂S/CO₂体系中疏水链上的双键对咪唑啉衍生物缓蚀性能的影响[J]. 中国腐蚀与防护学报, 2015, 35(6): 505-509.
[14]	陈启萌,张俊喜,原徐杰,戴念维. 外加交流电场对薄液膜中氧扩散的影响[J]. 中国腐蚀与防护学报, 2015, 35(6): 549-555.
[15]	苏铁军, 罗运柏, 李克华, 李凡修, 邓仕英, 习伟. 苯并咪唑-N-曼尼希碱对盐酸中N80钢的缓蚀性能[J]. 中国腐蚀与防护学报, 2015, 35(5): 415-422.

Viewed

Full text

Abstract

Cited

Shared

Discussed