Ce(NO<sub>3</sub>)<sub>2</sub>浓度及硅酸盐封孔处理对高铁枕梁用Mg-Zn-Y-Ca合金表面钙系磷化膜的影响

doi:10.11902/1005.4537.2021.202

中国腐蚀与防护学报

2021, Vol. 41

Issue (6): 849-856 DOI: 10.11902/1005.4537.2021.202

研究报告

本期目录 | 过刊浏览

Ce(NO₃)₂浓度及硅酸盐封孔处理对高铁枕梁用Mg-Zn-Y-Ca合金表面钙系磷化膜的影响

周殿买¹, 姜磊²(

), 王美婷², 梁洪嘉², 肖云龙², 郑黎², 于宝义²

^1.中车长春轨道客车股份有限公司长春 130062
^2.沈阳工业大学材料科学与工程学院沈阳 110023

Effects of Ce(NO₃)₂ Concentration and Silicate Sealing Treatment on Calcium Phosphating Film on Surface of Mg-Zn-Y-Ca Alloy for High Speed Railway Corbel

ZHOU Dianmai¹, JIANG Lei²(

), WANG Meiting², LIANG Hongjia², XIAO Yunlong², ZHENG Li², YU Baoyi²

^1.CRRC Changchun Railway Vehicles Co. Ltd. , Changchun 130062, China
^2.School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110023, China

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摘要:

通过点滴实验、全浸泡实验、电化学测试、扫描电镜及XRD分析，研究了稀土添加剂Ce(NO₃)₂浓度及硅酸盐封孔处理对枕梁用Mg-Zn-Y-Ca合金表面钙系磷化膜的影响。结果表明：Ce(NO₃)₂的加入和封孔处理都会改善膜层结构，提高膜层耐蚀性，且Ce(NO₃)₂的最优添加量为0.8 g/L。经封孔处理后膜层耐蚀性最优，其平均点滴时长为1002 s，浸泡腐蚀速率为0.0372 mg/(cm²·h)，腐蚀电流密度为4.971×10^-6 A/cm²，致密层电阻R_f为4854 Ω·cm²。通过磷化及封孔处理可大幅度提高镁合金防腐蚀性能，满足高铁枕梁服役要求。

关键词 ：钙系磷化膜, Ce(NO₃)₂, 封孔处理, 耐蚀性, 镁合金

Abstract：

With the demand for continuous increment in the running speed of high-speed trains, the standards for lightweight and ride comfort requirements have also been raised. Mg-alloy has become an inevitable trend as a critical material for high-speed trains made of alloy. The effect of Ce(NO₃)₂ concentration as rare earth additive in silicate containing solution for sealing treatment on the performance of calcium phosphating coating of Mg-Zn-Y-Ca alloy for swing bolster were studied by means of drop test, full immersion test, electrochemical test, scanning electron microscope and XRD analysis. The results show that the sealing treatments with and without the addition of Ce(NO₃)₂ all can improve the structure and corrosion resistance of the coating, and the optimal addition of Ce(NO₃)₂ is 0.8 g/L. Correspondingly, the acquired coating has the best corrosion resistance after sealing treatment, with an average drop time of 1002 s before break down of the coating, the corrosion rate of 0.0372 mg/(cm²·h), and the corrosion current density of 4.971×10^-6 A/cm², and the coating resistance R_f is 4854 Ω·cm². The corrosion resistance of magnesium alloy can be greatly improved through phosphating and sealing treatment, which can meet the service requirements of high-speed iron pillow beam.

Key words： calcium phosphating film Ce(NO₃)₂ hole sealing process corrosion resistance Mg-alloy

收稿日期: 2021-08-18

ZTFLH:

TG174

基金资助:中国国家铁路集团有限公司科技研究开发计划(P2020J024)

通讯作者: 姜磊 E-mail: 1138027122@qq.com

Corresponding author: JIANG Lei E-mail: 1138027122@qq.com

作者简介: 周殿买，男，1967年生，硕士，教授级高级工程师

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引用本文:

周殿买, 姜磊, 王美婷, 梁洪嘉, 肖云龙, 郑黎, 于宝义. Ce(NO₃)₂浓度及硅酸盐封孔处理对高铁枕梁用Mg-Zn-Y-Ca合金表面钙系磷化膜的影响[J]. 中国腐蚀与防护学报, 2021, 41(6): 849-856.
Dianmai ZHOU, Lei JIANG, Meiting WANG, Hongjia LIANG, Yunlong XIAO, Li ZHENG, Baoyi YU. Effects of Ce(NO₃)₂ Concentration and Silicate Sealing Treatment on Calcium Phosphating Film on Surface of Mg-Zn-Y-Ca Alloy for High Speed Railway Corbel. Journal of Chinese Society for Corrosion and protection, 2021, 41(6): 849-856.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.202 或 https://www.jcscp.org/CN/Y2021/V41/I6/849

图1 不同Ce(NO3)2浓度下的钙系磷化膜表面微观形貌

图2 稀土处理前后钙系磷化膜截面形貌图

图3 稀土处理前后的钙系磷化膜的EDS图谱

图4 稀土处理前后钙系磷化膜的XRD图谱

表1 不同Ce(NO3)2浓度下钙系磷化工艺的点滴实验结果

图5 基材及不同Ce(NO3)2浓度下钙系磷化试样的极化曲线

表2 不同Ce(NO3)2浓度下钙系磷化工艺的全浸泡实验结果

表3 基材及不同Ce(NO3)2浓度下钙系磷化试样的极化拟合结果

图6 基材及不同Ce (NO3) 2浓度下钙系磷化试样的电化学阻抗谱

图7 电化学阻抗谱的等效电路图

表4 不同Ce(NO3)2浓度下钙系磷化试样的电化学阻抗拟合结果

图8 封孔处理后钙系磷化膜的表面微观形貌及EDS分析

图9 封孔处理后钙系磷化膜的XRD谱

图10 镁合金试样浸泡腐蚀后的表面宏观形貌

图11 不同钙系磷化工艺后试样的极化曲线及电化学阻抗谱

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