Research Advances of Surface Strengthening Coatings for Agricultural Machinery and Equipment

Agricultural machinery components are subjected to multiple failure challenges, including wear, corrosion, and fatigue, during prolonged service under complex operating conditions. Surface coating technology is a critical approach to enhance service performance and has been extensively studied. This review proposes surface coating strategies for different agricultural machinery facing wear, corrosion, and fatigue conditions, and conducts a comparative analysis of laser cladding, thermal spraying, and physical vapor deposition technologies from the perspectives of wear resistance and field applicability. It classifies component types and failure modes, discusses coating functions, classifications, and analyzes strengthening mechanisms from microstructure, wear, and corrosion perspectives. Finally, the current challenges are summarized, and future development directions are discussed, to guide performance protection strategies for agricultural metal components.