Electrochemical characterization and microstructure of cold sprayed AA5083/Al2O3 composite coatings
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第24期
论文作者：Xiawei Yang Wenya Li Siqi Yu Yaxin Xu Kaiwei Hu Yaobang Zhao
摘 要：This work focused on the role of Al2O3particles in the corrosion behavior of cold sprayed AA5083 aluminum alloy matrix composite （Al-MMC） coatings.The electrochemical characterization of the coatings was investigated in a 3.5 wt.%Na Cl solution as a function of time.The results show that fragmentation of Al2O3particles is not clearly observed in the case of AA5083/20 vol.%Al2O3coating,while the broken Al2O3particles can be seen clearly in AA5083/40 vol.%Al2O3and AA5083/60 vol.%Al2O3coatings.The addition of 20 vol.%Al2O3particles yield the coating with the lowest porosity,and different volume fractions of Al2O3in the feedstock have important effects on the electrochemical behavior of composite coatings.The Al-MMC coating reinforced with 20 vol.%Al2O3particles exhibits the highest Ecorrand the lowest icorrcompared with the other conditions.The order of current density is as follows:AA5083/20vol.%Al2O3<AA5083<AA5083/40 vol.%Al2O3<AA5083/60 vol.%Al2O3.
Xiawei Yang1，Wenya Li1，Siqi Yu1，Yaxin Xu1，Kaiwei Hu1，Yaobang Zhao2
1. State Key Laboratory of Solidification Processing, Shaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University2. Shanghai Aerospace Precision Machinery Research Institute
摘 要：This work focused on the role of Al2O3particles in the corrosion behavior of cold sprayed AA5083 aluminum alloy matrix composite （Al-MMC） coatings.The electrochemical characterization of the coatings was investigated in a 3.5 wt.%Na Cl solution as a function of time.The results show that fragmentation of Al2O3particles is not clearly observed in the case of AA5083/20 vol.%Al2O3coating,while the broken Al2O3particles can be seen clearly in AA5083/40 vol.%Al2O3and AA5083/60 vol.%Al2O3coatings.The addition of 20 vol.%Al2O3particles yield the coating with the lowest porosity,and different volume fractions of Al2O3in the feedstock have important effects on the electrochemical behavior of composite coatings.The Al-MMC coating reinforced with 20 vol.%Al2O3particles exhibits the highest Ecorrand the lowest icorrcompared with the other conditions.The order of current density is as follows:AA5083/20vol.%Al2O3<AA5083<AA5083/40 vol.%Al2O3<AA5083/60 vol.%Al2O3.
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