Preparation method of high wear-resistant and corrosion-resistant composite coating for steel compression spring of firearm
By preparing a composite coating of graphene, ZrO2 nanoparticles and boron nitride on gun compression springs, the corrosion fatigue problem of springs under high-frequency loads and harsh environments was solved, the wear resistance and adhesion were improved, chromium contamination was avoided, and the coating stability at high temperatures was achieved.
Patent Information
- Authority / Receiving Office
- CN Β· China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHANGHAI UNIV
- Filing Date
- 2025-04-21
- Publication Date
- 2026-07-10
AI Technical Summary
Gun compression springs are prone to corrosion and fatigue fracture under high-frequency reciprocating loads and harsh environments. Existing coatings have problems such as poor wear resistance, insufficient adhesion, and chromium contamination.
A composite coating is formed by adding graphene, ZrO2 nanoparticles and boron nitride to a chromium-free Dacromet coating as a base, and then surface modification and step curing. The coating consists of zinc-aluminum powder, graphene, ZrO2 nanoparticles and flake boron nitride, and is prepared by modifying with a silane coupling agent and using a powder mixing and curing process.
It achieves high corrosion resistance, high wear resistance and strong adhesion, avoids hexavalent chromium contamination, the coating is stable at high temperature, the wear rate is reduced by 65%, and the adhesion is excellent.