铜在碳钢中扩散及其对碳钢耐腐蚀性的影响

doi:10.11901/1005.3093.2018.338

材料研究学报

2019, Vol. 33

Issue (3): 225-231 DOI: 10.11901/1005.3093.2018.338

本期目录 | 过刊浏览

铜在碳钢中扩散及其对碳钢耐腐蚀性的影响

马涛,李慧蓉,高建新,李运刚(

)

华北理工大学冶金与能源学院唐山 063009

Diffusion Behavior of Cu in Carbon Steel and Its Influence on Corrosion Resistance of Carbon Steel

Tao MA,Huirong LI,Jianxin GAO,Yungang LI(

)

College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063009, China

引用本文:

马涛,李慧蓉,高建新,李运刚. 铜在碳钢中扩散及其对碳钢耐腐蚀性的影响[J]. 材料研究学报, 2019, 33(3): 225-231.
Tao MA, Huirong LI, Jianxin GAO, Yungang LI. Diffusion Behavior of Cu in Carbon Steel and Its Influence on Corrosion Resistance of Carbon Steel[J]. Chinese Journal of Materials Research, 2019, 33(3): 225-231.

全文: PDF(3540 KB) HTML

摘要:

用水溶液电沉积法在碳钢表面电镀铜并进行高温扩散退火，用Den-Broeder法计算铜在碳钢中的扩散系数，研究了铜在碳钢中的扩散行为及其对碳钢耐腐蚀性的影响。结果表明，铜在碳钢中的扩散主要沿晶界进行，铜的扩散抑制了热处理过程中碳钢晶粒的长大。铜在碳钢中的扩散系数为1.11×10^-16~3.03×10^-11 cm²/s，扩散系数随着退火温度的提高而升高，随着铜浓度的提高而降低。铜在碳钢高温奥氏体区中扩散所需的激活能为126~167 kJ/mol，在高于低温铁素体+奥氏体混合区中激活能为90~108 kJ/mol。通过铜在碳钢中的扩散制备的Cu-Fe梯度材料，具有优良的耐腐蚀性。

关键词 ：金属材料, 铜, Cu-Fe梯度材料, 扩散系数, 扩散激活能, 极化曲线

Abstract：

The copper coating was deposited on the surface of carbon steel by electroplating method, and then annealed at high temperature. The diffusion coefficient of Cu in carbon steel were calculated by the Den-Broeder method, while the influence of Cu-metalizing on the corrosion resistance of carbon steel was investigated. Results show that the inward diffusion of Cu is mainly along grain boundaries of the carbon steel, while the diffusion of Cu will inhibit the growth of grains of the steel during heat treatment. The diffusion coefficient of Cu in carbon steel limits between 1.11×10^-16~3.03×10^-11 cm²/s, which increases with the increasing annealing temperature and decreases with the increasing Cu-concentration of copper. The diffusion activation energy of copper Cu in the ferrite + austenite region of carbon steel is between 90~108 kJ / mol at low temperatures, and in the ferrite region of carbon steel at high temperatures is between 126~167 kJ/mol. Furthermore, a Cu-Fe gradient material on the carbon steel gennerated via Cu-inward diffusion has better corrosion resistance rather than the bare carbon steel in NaCl solution.

Key words： metallic materials copper Cu-Fe gradient material diffusion coefficient diffusion active energy polarization curve

收稿日期: 2018-05-21

ZTFLH:

TG146.1

基金资助:国家自然科学基金(51774142);国家自然科学基金(51474088);河北省自然科学基金(E2017209239);华北理工大学研究生创新项目(2018B21)

作者简介: 马涛，男，1990年生，博士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2018.338 或 https://www.cjmr.org/CN/Y2019/V33/I3/225

图1 在不同温度下退火扩散后界面的铜、铁含量的分布

图2 铜铁扩散偶在1050℃退火扩散后的金相显微组织

图3 在1050℃退火扩散后试样截面的SEM照片和EDS线扫描分析

图4 铜在碳钢中的扩散系数与铜浓度和退火温度的关系

图5 Fe-Cu合金的相图

图6 不同温度区间不同铜浓度条件下扩散系数与温度的关系

表1 不同组织中不同Cu含量条件下的扩散激活能Q

图7 实验条件下Fe-C合金相图

表2 3.5%NaCl溶液中碳钢、镀铜碳钢及Cu-Fe合金极化曲线拟合结果

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