Mg-Gd-Y-Zn-Zr合金在NaCl和Na2SO4 溶液中腐蚀行为研究

doi:10.11902/1005.4537.2024.390

中国腐蚀与防护学报

2025, Vol. 45

Issue (5): 1289-1299 CSTR: 32134.14.1005.4537.2024.390 DOI: 10.11902/1005.4537.2024.390

研究报告

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Mg-Gd-Y-Zn-Zr合金在NaCl和Na₂SO₄ 溶液中腐蚀行为研究

蔡科涛¹^,², 季磊³, 张震³(

), 冯强¹^,², 邓伟林¹^,², 兰贵红⁴, 何莎¹^,², 赵占勇³, 白培康³

1 四川科特检测技术有限公司广汉 618300
2 川庆钻探工程有限公司安全环保质量监督检测研究院广汉 618300
3 中北大学材料科学与工程学院太原 030051
4 西南石油大学化学化工学院成都 610500

Corrosion Behavior of Mg-Gd-Y-Zn-Zr Alloy in NaCl and Na₂SO₄ Solutions

CAI Ketao¹^,², JI Lei³, ZHANG Zhen³(

), FENG Qiang¹^,², DENG Weilin¹^,², LAN Guihong⁴, HE Sha¹^,², ZHAO Zhanyong³, BAI Peikang³

1 Sichuan Kete Testing Technology Co., Ltd., Guanghan 618300, China
2 Safety and Environmental Quality Supervision and Testing Institute of Chuanqing Drilling Engineering Co., Ltd., Guanghan 618300, China
3 School of Materials Science and Engineering, North University of China, Taiyuan 030051, China
4 School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China

引用本文:

蔡科涛, 季磊, 张震, 冯强, 邓伟林, 兰贵红, 何莎, 赵占勇, 白培康. Mg-Gd-Y-Zn-Zr合金在NaCl和Na₂SO₄ 溶液中腐蚀行为研究[J]. 中国腐蚀与防护学报, 2025, 45(5): 1289-1299.
Ketao CAI, Lei JI, Zhen ZHANG, Qiang FENG, Weilin DENG, Guihong LAN, Sha HE, Zhanyong ZHAO, Peikang BAI. Corrosion Behavior of Mg-Gd-Y-Zn-Zr Alloy in NaCl and Na₂SO₄ Solutions[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(5): 1289-1299.

全文: PDF(15966 KB) HTML

摘要:

采用析氢测量、失重测试、阴极极化曲线、电化学阻抗谱和腐蚀形貌观察等方法研究Mg-Gd-Y-Zn-Zr合金在NaCl和Na₂SO₄溶液中的腐蚀行为。结果表明，Mg-Gd-Y-Zn-Zr合金在0.6 mol/L NaCl溶液中的腐蚀速率远高于0.6 mol/L Na₂SO₄溶液。在NaCl溶液中Mg-Gd-Y-Zn-Zr合金表面迅速形成针状氧化膜，随着浸泡进行氧化膜变厚，出现大量微裂纹；在Na₂SO₄溶液中Mg-Gd-Y-Zn-Zr合金浸泡初期氧化膜较薄，随着浸泡进行氧化膜呈絮状特征，腐蚀产物层观察到明显硫富集。腐蚀形貌结果显示，Mg-Gd-Y-Zn-Zr合金在NaCl溶液中α-Mg基体优先腐蚀，腐蚀较深，呈现局部腐蚀特征，而在Na₂SO₄溶液中第二相优先腐蚀，腐蚀较浅，腐蚀程度相对均匀。基于上述结果，从氧化膜形成和电偶腐蚀方面讨论了Cl^-和SO $4 2 -$ 对Mg-Gd-Y-Zn-Zr合金腐蚀行为的影响机制。

关键词 ：稀土镁合金, 腐蚀行为, 第二相, 氧化膜, 电偶腐蚀

Abstract：

The corrosion behavior of Mg-Gd-Y-Zn-Zr alloy in NaCl and Na₂SO₄ solutions was studied using hydrogen evolution measurement, mass loss measurement, cathodic polarization curve, electrochemical impedance spectroscopy and corrosion morphology observation. The results indicated that the corrosion rate of Mg-Gd-Y-Zn-Zr alloy in 0.6 mol/L NaCl solution was much higher than that in 0.6 mol/L Na₂SO₄ solution. A scale of needle-like oxides rapidly formed on the surface of Mg-Gd-Y-Zn-Zr alloy in NaCl solution. As immersion progressed, the oxide scale thickened and a large number of micro-cracks appeared. In the initial stage of Mg-Gd-Y-Zn-Zr alloy soaking in Na₂SO₄ solution, the oxide scale was relatively thin. With the increasing soaking time, the oxide scale exhibited a flocculent characteristic, and significant sulfur enrichment was observed in the corrosion products scale. The corrosion morphology observation showed that the α-Mg matrix of Mg-Gd-Y-Zn-Zr alloy was preferentially dissolved in NaCl solution with deeper and localized corrosion characteristics. In Na₂SO₄ solution, the second phase preferentially corroded with shallower and relatively uniform corrosion. Based on the above results, the influence mechanism of Cl^- and SO $4 2 -$ on corrosion behavior of Mg-Gd-Y-Zn-Zr alloy was discussed from the aspects of oxide scale formation and galvanic corrosion.

Key words： rare-earth Mg alloy corrosion behavior second phase oxide scale galvanic corrosion

收稿日期: 2024-12-02 32134.14.1005.4537.2024.390

ZTFLH:

TG174

基金资助:国家自然科学基金(52105409);山西省基础研究计划(20210302124042)

通讯作者: 张震，E-mail：zzhang14s@alum.imr.ac.cn，研究方向为增材制造金属材料腐蚀行为

Corresponding author: ZHANG Zhen, E-mail: zzhang14s@alum.imr.ac.cn

作者简介: 蔡科涛，男，1985年生，硕士生，高级工程师

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https://www.jcscp.org/CN/10.11902/1005.4537.2024.390 或 https://www.jcscp.org/CN/Y2025/V45/I5/1289

图1 Mg-10Gd-4Y-2Zn-0.5Zr合金表面SEM形貌及EDS元素面扫结果

表1 图1中标记点处EDS成分分析结果 (atomic fraction / %)

图2 Mg-10Gd-4Y-2Zn-0.5Zr合金分别在0.6 mol/L NaCl溶液和0.6 mol/L Na2SO4溶液中浸泡7 d时的析氢量、析氢速率和平均腐蚀速率

图3 Mg-10Gd-4Y-2Zn-0.5Zr合金分别在0.6 mol/L NaCl溶液和0.6 mol/L Na2SO4溶液中浸泡不同时间后的阴极极化曲线

图4 Mg-10Gd-4Y-2Zn-0.5Zr合金在0.6 mol/L NaCl溶液和0.6 mol/L Na2SO4溶液中Icorr值随浸泡时间演变的柱状图

图5 Mg-10Gd-4Y-2Zn-0.5Zr合金分别在0.6 mol/L NaCl溶液和0.6 mol/L Na2SO4溶液中浸泡不同时间的Nyquist图、Bode模值图和Bode相角图

图6 Mg-10Gd-4Y-2Zn-0.5Zr合金在0.6 mol/L NaCl溶液和0.6 mol/L Na2SO4溶液中浸泡时EIS的等效电路图

图7 Rp随浸泡时间的变化曲线

图8 Mg-10Gd-4Y-2Zn-0.5Zr合金分别在0.6 mol/L NaCl溶液和0.6 mol/L Na2SO4溶液中浸泡不同时间后的表面形貌

图9 Mg-10Gd-4Y-2Zn-0.5Zr合金分别在0.6 mol/L NaCl溶液和0.6 mol/L Na2SO4溶液中浸泡24 h后的截面腐蚀形貌及其EDS元素面扫图

图10 Mg-10Gd-4Y-2Zn-0.5Zr合金分别在0.6 mol/L NaCl溶液和0.6 mol/L Na2SO4溶液中浸泡不同时间后的SEM表面形貌以及浸泡24 h后表面EDS元素面扫图

图11 Mg-10Gd-4Y-2Zn-0.5Zr合金分别在0.6 mol/L NaCl溶液和0.6 mol/L Na2SO4溶液中浸泡24 h后的截面腐蚀形貌

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