有/无应力下LY12CZ铝合金点蚀数据的关联规律

中国腐蚀与防护学报

2009, Vol. 29

Issue (6): 504-508

研究报告

本期目录 | 过刊浏览

有/无应力下LY12CZ铝合金点蚀数据的关联规律

仝基斌¹;饶思贤^1;朱立群²;钟群鹏²

1. 安徽工业大学机械工程学院马鞍山 243001
2. 北京航空航天大学材料科学与工程学院北京 100083

CORRELATION BETWEEN THE PITTING DEPTH OF LY12CZ WITH OR WITHOUT STRESS

TONG Jibin¹; RAO Sixian¹; ZHU Liqun²; ZHONG Qunpeng²

1. Department of Mechanical Engineering; Anhui University of Technology; Ma'an'shan 243001
2. School of Material Science and Engineering; Beihang University; Beijing 100083

全文: PDF(739 KB)

摘要:

根据理论假设和计算得出LY12CZ在3%NaCl水溶液中点蚀深度D_σ与外加应力σ及腐蚀时间t间符合等式D_σ=AΧC₀exp(bσ)tⁿ=A' tⁿ，表明在腐蚀时间相同的情况下，点蚀深度与外加应力之间应符合 D_σ =D ₀exp(bσ)t ⁿ的指数函数规律；外加应力相同的条件下点蚀扩展速率与腐蚀时间符合D_σ=A' tⁿ的幂函数的规律。不同外加应力下的腐蚀浸泡实验证明，LY12CZ的点蚀深度D_σ扩展确实符合D_σ ∝exp(bσ)t ⁿ的规律。实验结果证明，铝合金的点蚀数据在有应力的条件下与无应力条件下具有相同的腐蚀深度-时间的幂函数规律，只是随应力大小的不同系数值有不同的变化，A值与外加应力间符合推导的 A'=Aexp(bσ)指数函数规律。所以通过对 A值进行修正可以将无应力下的自然腐蚀环境下的腐蚀数据推广到有外加应力的条件下使用。

关键词 ：点蚀, 外加应力, LY12CZ

Abstract：

The relationship between the pitting depth（D_σ）of LY12CZ in 3%NaCl aqueous solution and applied stress（σ） and corrosion time（t） was calculated，and the results showed that the correlation was accorded with the formula D_σ=AΧC₀exp(bσ)tⁿ=A' tⁿ , the formula indicated that the relationship between pitting depth and applied stress was accorded with exponential function D_σ =D ₀exp(bσ)t ⁿ under the same corrosion time and power function D_σ=A' tⁿunder the same applied stress. Experiment results under various applied stress prove that correctness of the formula above, the experimental results showed that pitting data of LY12CZ accords with the same power function D_σ=A' tⁿno matter what applied stress existed or not, the influence of applied stress was showed in the coefficient of A, the relationship between A'(coefficient A under stress) and σ was D_σ=AΧexp(bσ). so the pitting data of aluminum alloys in natural environment could be extended to the natural environment corrosion under applied stress through amendment to the coefficient A.

Key words： pitting applied stress LY12CZ

收稿日期: 2008-09-10

ZTFLH:

TG174.3

基金资助:

国家重点基础研究发展规划项目（G1999065010）资助

通讯作者: 饶思贤 E-mail: raosixian@ahut.edu.cn

Corresponding author: RAO Sixian E-mail: raosixian@ahut.edu.cn

作者简介: 仝基斌，男, 1978年生，博士生，研究方向为金属的腐蚀与失效

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引用本文:

仝基斌饶思贤朱立群钟群鹏. 有/无应力下LY12CZ铝合金点蚀数据的关联规律[J]. 中国腐蚀与防护学报, 2009, 29(6): 504-508.
RAO Sai-Xian, TONG Ji-Bin, ZHU Li-Qun. CORRELATION BETWEEN THE PITTING DEPTH OF LY12CZ WITH OR WITHOUT STRESS. J Chin Soc Corr Pro, 2009, 29(6): 504-508.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2009/V29/I6/504

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