Corrosion mechanism of ZTAp-Fe material used in coal transportation equipment

Abstract

Due to the harsh underground environment, underground coal transportation equipment made of traditional steel materials has a relatively low service life. Through electrochemical test, scanning electron microscope observation, energy spectrum analysis and other tests, the law of corrosion resistance, microstructure and element distribution of ZTAp reinforced iron matrix composites prepared by powder metallurgy is explored, the corrosion resistance mechanism of ZTAp-Fe material is revealed. The results show that ZTAp and the iron matrix are in good bonding state in the ZTAp-Fe materials, and the interface is non-metallurgical bonding. With the introduction of 20 % ZTAp in the iron matrix alloy, the corrosion rate decreased from 0.909 28 mm/a to 0.365 14 mm/a, and the resistance of charge transfer (Rct)increases from 775.6 Ω·cm2 to 1025.3 Ω·cm2. The corrosion resistance of ZTAp is better than that of iron matrix. The formation of corrosion products at the interface effectively inhibits the corrosive medium from further corroding the interface between ZTAp and the iron matrix. ZTAp reinforced iron matrix composites can effectively increase the service life of coal transportation equipment.

Keywords

• composite
• electrochemistry
• corrosion mechanism
• powder metallurgy
• interface