Tribological Behavior Of Electrocodeposited Nano Composites On Magnesium Alloys Using Direct And Pulse Current – A Review

摘要

Coating on magnesium alloys continues to remain as a great challenge because of its highly reactive nature. Although many conventional surface treatment methods are available, electrocodeposition is still considered to be the most versatile and economical procedure. This article extensively discusses about various pretreatment procedures for magnesium alloys and the effect of current waveforms on the tribological characteristics of coatings. Most of the literatures available today focus on the investigation of the behavior of the coatings prepared by direct current. Very limited literature is available on the coating of magnesium alloys using pulse current. In this article, an in depth analysis and comparison has been done between the aspects of the composite coatings produced using direct current and various wave forms of the pulse current. From this review it is understood that pulse current is capable of producing more efficient coatings and functionally graded coatings could be obtained by controlling the waveforms. From this review, it is learnt that the potentiality of waveforms in electrodeposition could be explored further to produce durable surface composite coatings on magnesium alloys.