Durable controllable chemical conversion multilayer coatings for enhancing adhesion strength and tribological properties towards anti-galling in cold forging

Achieving durable lubricating coatings for effectively preventing galling damage of alloys remains challenging in cold forging industries due to insufficient interfacial adhesion strength and inadequate tribological properties. Herein, we engineered an emerging class of multifunctional multilayer coatings on 6082 Al alloy substrates by a controllable chemical conversion strategy, featuring a hierarchical architecture composed of three distinct functional layers: a cryolite seeding layer, a hopeite supporting carrier layer, and a stearate lubrication layer. The multilayer coatings with integrated multifunctionality exhibited high interfacial bonding strength and enhanced tribological properties, demonstrating desirable galling resistance in cold forging. The synergistic combination of cryolite precursor particles seeded on the Al surface and subsequent in-situ grown hopeite flakes significantly enhanced the interfacial adhesion strength (~19 N scratch strength). The compact and rough hopeite flakes facilitated the adsorption and retention of greater quantities of stearate lubricant, resulting in the formation of stable multilayer coatings, which exhibited the lowest coefficient of friction (0.13) and a shallow wear track. After cold forging with 85 % deformation, the workpiece with the optimized multilayer coatings retained a lubricating layer and demonstrated effective anti-galling performance. The multilayer coatings with improved adhesion strength and tribological properties provided sufficient shear and galling resistance in long sliding distance between the tool and the workpiece. The present design for durable multilayer coatings may provide a promising strategy for achieving excellent adhesion strength and tribological properties, contributing to anti-galling applications in various cold-forming industries.

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成果名称:低表面能涂层

合作方式:技术开发

联 系 人:周老师

联系电话:13321314106

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成果名称:低表面能涂层

合作方式:技术开发

联 系 人:周老师

联系电话:13321314106

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成果名称:低表面能涂层

合作方式:技术开发

联 系 人:周老师

联系电话:13321314106

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成果名称:低表面能涂层

合作方式:技术开发

联 系 人:周老师

联系电话:13321314106

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