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Comparison of the effects of pre-activators on morphology and corrosion resistance of phosphate conversion coating on magnesium alloy

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Journal of Magnesium and Alloys 2022年第12期10卷 3485-3494页

作者： Tao Li Zhongjun Leng Shifang Wang Xitao Wang reza ghomashchi Yuansheng Yang Jixue Zhou Shandong Provincial Key Laboratory of High Strength Lightweight Metallic Materials Advanced Materials InstituteQilu University of Technology(Shandong Academy of Sciences)Jinan 250014China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Mechanical Engineering The University of AdelaideAdelaide SA 5005Australia

In this study, Mg–6.0Zn–3.0Sn–0.5Mn(ZTM630) magnesium alloy was pre-activated by colloidal Ti, oxalic acid, and phosphoric acid,and a phosphate conversion coating(PCC) was prepared on the alloy surface. The morphology and corrosion resistance of the prepared PCCs were investigated. Surface morphology studies showed that the phosphate crystals that formed the coating were the smallest for the sample pre-activated by phosphoric acid. The coating on the colloidal Ti and the phosphoric acid samples had the largest and the smallest thickness and surface roughness, respectively. The reason for the discrepancy was analyzed by comparing the surface morphologies of alloy samples immediately after the pre-activation treatment and various phosphating treatments. X-ray diffraction analysis revealed that all three PCCs contained the same compounds. The corrosion resistance time from the copper sulfate drop test and the electrochemical data from the potentiodynamic polarization curves showed that the coating pre-activated by phosphoric acid had the best corrosion resistance. Finally, the 1500 h neutral salt spray corrosion test confirmed that the phosphating treated magnesium alloy, which was pre-activated by phosphoric acid,exhibited excellent corrosion resistance and behavior.

关键词： Phosphate conversion coating Surface pre-activator Magnesium alloy Morphology Corrosion

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Diffusion growth of Φ ternary intermetallic compound in the Mg-Al-Zn alloy system:In-situ observation and modeling

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Journal of Materials Science & Technology 2021年第1期60卷 222-229页

作者： Kaiming Cheng Jiaxing Sun Huixia Xu Jin Wang Chengwei Zhan reza ghomashchi Jixue Zhou Shouqiu Tang Lijun Zhang Yong Du Shandong Provincial Key Laboratory of High Strength Lightweight Metallic Materials Advanced Materials InstituteQilu University of Technology(Shandong Academy of Sciences)Jinan 250014China Engineering Research Center of Failure Analysis and Safety Assessment Shandong Analysis and Test CenterQilu University of Technology(Shandong Academy of Sciences)Jinan 250014China School of Mechanical Engineering The University of AdelaideAdelaide SA 5005Australia State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China

Study on the diffusion growth of ternary intermetallic compounds in Mg-Al-Zn based light-weight alloys is important due to its close interrelation with alloy property.However,there is a very lack of existing data due to difficulties in both experimental and computational aspects.The current work aims at presenting the experimental observation on the diffusion growth behavior of Φ phase at 360℃ as well as calculating its composition-dependent interdiffu sion coefficients.We designed and succes s fully fabricated four Mg-τ ternary diffusion couples annealed at 360℃ for different times,where the diffusion path goes across the Φ phase region and the diffusion growth of ternary intermetallic compound can be solely detected.In-situ observation of the time-dependent growth of Φ phase was performed to accurately determine the parabolic growth constant.The experimental data were then subjected to a numerical inverse method to generate a set of self-consistent interdiffusivities of the ternary intermetallic compounds,which can reproduce the presently observed diffusion growth behavior of Φ ternary intermetallic compound in Mg-τ diffusion couples.

关键词： Diffusion Intermetallic compounds Interface migration Numerical inverse methods High-temperature laser-scanning confocal microscopy(HTLSCM)

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