Tan Xiaofeng, Guo Pengyan, Shi Boqiang. Surface Plasma Coagulation Treatment of AZ91 Alloy for Automobile Engine[J]. Special Casting & Nonferrous Alloys, 2016,36(5):477-480.
Tan Xiaofeng, Guo Pengyan, Shi Boqiang. Surface Plasma Coagulation Treatment of AZ91 Alloy for Automobile Engine[J]. Special Casting & Nonferrous Alloys, 2016,36(5):477-480. DOI: 10.15980/j.tzzz.2016.05.009.
Surface modification of AZ91 alloy for automobile engine was carried out by plasma coagulation process
and effects of the current on the microstructure
wear resistance and corrosion resistance of the modified layer were analyzed.The results reveal that the modified layer is composed ofα-Mg andβ-Mg17Al12
which is the same with phase constituent of the AZ91 matrix alloy
however
the phase content in the modification layer is the higher than that in the matrix alloy.With the increase of current
theβ-Mg17Al12 phase content in the modified layer is increased.The wear loss of modification layer with65 A
55Aand 45 Ais the lower than that of AZ91 alloy
and the wear loss of the coating layer is decreased gradually with the increase of current.The corrosion resistance of the alloy is improved after surface modification
and the corrosion resistance of the alloy is as follows:65Acladding layer>55A cladding layer>45Acladding layer>AZ91alloy matrix.The corrosion morphology is consistent with the results of the dynamic potential polarization curves.