Effects of Al-Mg on the Microstructure and Phase Distribution of Zn-Al-Mg Coatings

In this work, the composition of zinc–aluminum–magnesium alloy coating was designed to have a fixed aluminum–magnesium ratio 1:1, while content aluminum and magnesium elements increases gradually within range 1–2 wt.%. The micro-morphology with different compositions observed by scanning electron microscope (SEM). Combined surface distribution results energy dispersive spectrometer (EDS) analysis phase diffraction X-rays (XRD), is understood. statistical calculation carried out after staining SEM image ImageJ, This consistent solidification simulation thermodynamic software (PADAT). influence on microscopic morphology (ZnAlMg) studied, mechanism action analyzed. show that volume binary eutectic (Zn/MgZn2) ternary (Zn/Al/MgZn2) in tends increase as contents two elevate. quantity MgZn2 critical factor for corrosion resistance coating; more MgZn2, better resistance.