Microstructural characteristics and protection performances of plasma-sprayed Al 2 O 3 –Al composite coatings on AZ91D magnesium alloy
Source abstract
Abstract
Abstract Four Al 2 O 3 -Al composite coatings were successfully fabricated on AZ91D alloy by plasma sprayed with changing ratios of Al 2 O 3 and Al mixed powders, respectively. XRD results indicate that all the composite coatings are composed of γ-Al 2 O 3 , α-Al 2 O 3 , and Al. SEM and EDS analysis find that Al 2 O 3 -Al composite coatings present the interlaced structures of Al and Al 2 O 3 bands. VIDAS image analysis reveals that the porosities of the composite coatings are increased by adding Al 2 O 3 . In the composite coatings, the hardness of Al is about 62 HV and that of Al 2 O 3 is up to 1380 HV. The electrochemical polarization tests testify that Al 2 O 3 -Al composite coatings can effectively protect AZ91D alloy from corroding in a chloride environment. The wear test results confirm that the wear resistance of Al 2 O 3 -Al composite coatings is markedly superior to that of AZ91D alloy. The excellent protection degrees are attributed to their particular compositions, microstructures, and properties. Moreover, the effect of Al 2 O 3 contents on the microstructures and protection performances of Al 2 O 3 -Al composite coatings was also studied and discussed in detail.
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Research context
OpenAlex topics: Magnesium Alloys: Properties and Applications · Aluminum Alloys Composites Properties · Corrosion Behavior and Inhibition
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Materials Science and Engineering, Shenyang Ligong University, No. 6, Nanping Center Road, Hunnan New District, Shenyang 110159, China
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