Structure, micro-hardness and corrosion behaviour of the Al–Si/Al2O3 coatings prepared by laser plasma hybrid spraying on magnesium alloy

Magnesium alloys are a promising structural material to be used as a substitute for metals traditionally used in the automotive and aircraft sector. However, magnesium alloys have poor mechanical properties and corrosion resistance. These handicaps can be overcome through the application of coatings with improved properties. Laser cladding is a potential coating fabrication process. Furthermore, the low vaporization temperature of magnesium and the coating-substrate dilution problems increase the difficulty to coat magnesium substrates. The aim of this research is to analyze the state of art in magnesium laser cladding and investigate the effect of the most important fabrication parameters on the interaction of the different coating-substrate systems used on the mechanical properties and corrosion resistance. In addition, this work provides a guidance on laser cladding best practices for these alloys. Knowledge of how the different coating manufacturing parameters affect the final surface properties of magnesium alloys is essential for the implantation of these materials in applications for which they are currently limited.

show abstract

“…However, this dilution can be of great benefit to the wear resistance. Other authors found similar results [46,47].…”

Section: Metal Matrix Composite Coatingssupporting

confidence: 70%

An Introduction on the Laser Cladding Coatings on Magnesium Alloys

Riquelme

Rodrigo

2021

Metals

View full text Add to dashboard Cite

show abstract

“…Unfortunately, to date, the precise mechanisms are unclear. This is because previous investigations have examined only the AZ91D substrate, in which relatively high content of Al was suitable for the LMI technique due to good physicochemical compatibility of aluminum with pure magnesium and its alloys [7][8][9][10][11][12]. It is believed that a more complete understanding of the full effect of Cu rejection in the absence of Al will shed light on the complicated mechanisms operating in laser forming HEA composite coating for Mg-based alloys.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…However, there is still great limitation of available materials due to inherent low melting and boiling points as well as chemical activity of the substrates. Thus, to date, in addition to Al + ceramic particles [7][8][9][10][11][12], it is still difficult to find suitable materials capable of using in LSTs of magnesium alloys.…”

Section: Introductionmentioning

confidence: 99%

The effect of Cu rejection in laser forming of AlCoCrCuFeNi/Mg composite coating

et al. 2016

View full text Add to dashboard Cite

“…In addition, a significant decrease in the i corr to 7.3 µA/cm 2 from 241.5 µA/cm 2 was observed after the MAO coating. The presence of noninterconnected micro-defects in the relatively thick MAO layer can slow the transportation of the electrolyte and reduce i corr of the coated sample [16,17]. Note that MAO/PLA coating underwent lowest i corr of 0.03 µA/cm 2 which can be attributed to the sealing of porosities and microcracks of the MAO coating and thus interrupting the penetration of the corrosive species to the Mg substrate.…”

Section: Fig3mentioning

confidence: 99%