Ca-P涂层和Sr-P涂层对脉冲磁场下凝固的Mg-Zn-Zr-Gd合金耐蚀性的影响

doi:10.11902/1005.4537.2022.197

中国腐蚀与防护学报

2023, Vol. 43

Issue (3): 647-655 CSTR: 32134.14.1005.4537.2022.197 DOI: 10.11902/1005.4537.2022.197

研究报告

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Ca-P涂层和Sr-P涂层对脉冲磁场下凝固的Mg-Zn-Zr-Gd合金耐蚀性的影响

毛训聪, 陈乐平(

), 彭聪

南昌航空大学航空制造工程学院南昌 330063

Effect of Chemical Conversion Coatings Ca-P and Sr-P on Corrosion Resistance of Mg-Zn-Zr-Gd Alloy Cast After Solidifying by Pulsed Magnetic Field

MAO Xuncong, CHEN Leping(

), PENG Cong

School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nannchang 330063, China

全文: PDF(15707 KB) HTML

摘要:

利用电化学测试、浸泡实验和扫描电镜等方法，研究Ca-P涂层和Sr-P涂层对脉冲磁场下凝固的Mg-Zn-Zr-Gd合金耐蚀性能的影响。研究表明，脉冲磁场下凝固的基体试样的耐蚀性能比无脉冲磁场下凝固的基体试样更好；且基体试样的耐蚀性能对其表面涂层的耐蚀性能会产生一定的影响，基体试样的耐蚀性能越好，其表面制备的涂层耐蚀性能也越好。另外，不同成分的化学涂层其耐蚀性能也不同，Ca-P涂层由大量棒状组织组成，棒状颗粒分布不均匀且较为疏松，且厚度不均匀；Ca-P涂层腐蚀形貌均有较多的孔洞，且腐蚀产物疏松。Sr-P涂层由许多细小的结晶状颗粒组织组成，且厚度均匀；Sr-P涂层的腐蚀程度均比较低，且腐蚀产物比较致密，从而阻碍了合金进一步被腐蚀。结果表明，Sr-P涂层和Ca-P涂层都提高了合金试样的耐蚀性能，且Sr-P涂层的耐蚀性能优于Ca-P涂层，优于无涂层Mg-Zn-Zr-Gd合金。

关键词 ： Mg-Zn-Zr-Gd合金, Sr-P涂层, Ca-P涂层, 耐蚀性能

Abstract：

The effect of chemical conversion coatings Ca-P and Sr-P on the corrosion resistance of Mg-Zn-Zr-Gd alloy, which was solidified by pulsed magnetic field and then cast, was studied by means of immersion test, electrochemical measurement, scanning electron microscopy and other methods. This investigation revealed that the corrosion resistance of the substrate sample, which was solidified by pulsed magnetic field, was better than that of the substrate sample, which was solidified without pulsed magnetic field, and the corrosion resistance of the substrate sample has a certain influence on the corrosion resistance of the coating, the better the corrosion resistance of the substrate sample, the better the corrosion resistance of the coating prepared on the surface. In addition, different chemical coatings have different corrosion resistance, the Ca-P coating was composed of a large number of rod-shaped particles, which were unevenly distributed and relatively loose, and the thickness was non uniform, the observation of corrosion morphology of the Ca-P coating showed that loose corrosion products with large number of voids were formed in the coating. The Sr-P coating was composed of many fine granular with uniform thickness, the corrosion products of the Sr-P coating were relatively dense, which hindered the possibility of further corrosion of the alloy. The results showed that both Sr-P and Ca-P coatings can improve the corrosion resistance of the substrate, and the corrosion resistance of the Sr-P coating was better than that of the Ca-P coating.

Key words： Mg-Zn-Zr-Gd alloy Sr-P coating Ca-P coating corrosion resistance

收稿日期: 2022-06-15 32134.14.1005.4537.2022.197

ZTFLH:

TG146.22

基金资助:江西省科技重点研发项目(20212BBE53018);江西省教育厅科技项目(DA202103161)

通讯作者: 陈乐平，E-mail：jnnclp@163.com，研究方向为金属腐蚀与防护

Corresponding author: CHEN Leping, E-mail: jnnclp@163.com

作者简介: 毛训聪，男，1997年生，硕士生

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引用本文:

毛训聪, 陈乐平, 彭聪. Ca-P涂层和Sr-P涂层对脉冲磁场下凝固的Mg-Zn-Zr-Gd合金耐蚀性的影响[J]. 中国腐蚀与防护学报, 2023, 43(3): 647-655.
MAO Xuncong, CHEN Leping, PENG Cong. Effect of Chemical Conversion Coatings Ca-P and Sr-P on Corrosion Resistance of Mg-Zn-Zr-Gd Alloy Cast After Solidifying by Pulsed Magnetic Field. Journal of Chinese Society for Corrosion and protection, 2023, 43(3): 647-655.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.197 或 https://www.jcscp.org/CN/Y2023/V43/I3/647

图1 未经及经过脉冲磁场处理合金的铸态形貌

图2 不同处理方式对合金的晶粒尺寸和第二相体积分数的影响

图3 脉冲磁场处理合金的不同涂层的微观组织

表1 图3中标定区域A和B的EDS分析结果 (atomic fraction / %)

图4 两种涂层的XRD谱

图5 不同涂层的动电位极化曲线

表2 动电位极化曲线的Tafel拟合结果

图6 脉冲磁场处理试样的阻抗谱曲线

图7 Ca-P和Sr-P涂层的等效电路图

表3 脉冲磁场处理试样阻抗曲线的电路拟合结果

图8 六组脉冲试样在Hank's溶液中浸泡7 d后pH变化及腐蚀速率曲线

图9 不同基体表面在Hank's溶液中浸泡7 d后的腐蚀形貌

图10 不同基体表面的不同涂层在Hank's溶液中浸泡7 d后腐蚀形貌

图11 不同基体表面的不同涂层腐蚀示意图

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