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

doi:10.11902/1005.4537.2022.197

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

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

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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

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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

Received: 15 June 2022 32134.14.1005.4537.2022.197

ZTFLH:

TG146.22

Fund: Science and Technology Key R&D Project of Jiangxi Provincial(20212BBE53018);Department of Education Science and Technology Funding Project of Jiangxi Provincial(DA202103161)

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

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Cite this article:

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.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2022.197 OR https://www.jcscp.org/EN/Y2023/V43/I3/647

Fig.1 Original microstructure of alloy of untreated (a) and pulsed magnetic field treatment (b)

Fig.2 Effects of different treatment methods on the grain size and volume fraction of the second phase of the alloy

Fig.3 Microstructures of different coatings of the pulsed magnetic field treatment alloy Ca-P-M1 (a1, a2), Ca-P-M9 (b1, b2), Sr-P-M1 (c1, c2) and Sr-P-M9 (d1, d2)

Table 1 Results of EDS analysis for the calibrated regions A and B in Fig.3

Fig.4 XRD pattern of Ca-P coating (a), and Sr-P coating (b)

Fig.5 Curve of dynamic potential polarization (pulse) of different coating

Table 2 Tafel fitting results of the dynamic potential polarization curve

Fig.6 Impedance spectral curve of the pulsed magnetic field processing specimen

Fig.7 Equivalent circuit diagrams of Ca-P (a) and Sr-P (b) coating

Table 3 Circuit fitting results of pulsed magnetic field processing of specimen impedance curves

Fig.8 Variation of the pH of the solution (a) and corrosion rate (b) of pulsed specimens soaked in Hank's solution for 7 d

Fig.9 Corrosion morphologies (a1, b1) and cross-sectional morphologies (a2, b2) of M1 (a1, a2) and M9 (b1, b2) matrix surfaces in Hank's solution for 7 d

Fig.10 Corrosion surface morphologies (a1-d1) and cross-sectional morphologies (a2-d2) of Ca-P-M1 (a1, a2), Ca-P-M9 (b1, b2), Sr-P-M1 (c1, c2) and Sr-P-M9 (d1, d2) coatings on different matrix surfaces in Hank's solution for 7 d

Fig.11 Schematic diagram of corrosion of different coatings on different matrix surfaces

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