本发明提供一种耐腐蚀合金接箍及其涂层方法，该接箍由两端对称的内螺纹段和接箍中孔段一体形成，内螺纹和接箍中孔之间设有接箍密封面，内螺纹、接箍密封面和接箍中孔分别设有涂层。该涂层的材料是聚四氟乙烯、三氧化二铝、氧化铜、氧化钛TiO₂和高分子酚醛树脂有机粘结剂混合溶液。该涂层的喷涂方法包括预处理、表面清洁、预热、涂敷涂层、高温固化等步骤。本发明的有益效果是：该涂层具有防护及抗粘扣功能，能够代替之前的耐腐蚀合金接箍镀铜工艺，应用该涂层技术，在生产中解决了镀铜的环境污染问题，在存储中避免了铜层氧化变色的现象，在拧接中由于涂层本身具有润滑功能而使耐腐蚀合金接箍的抗粘扣效果更好。

The invention provides a corrosion-resistant alloy coupling and a coating method thereof. The coupling is integrally formed by an inner thread section with two symmetrical ends and a coupling middle hole section, wherein a coupling seal face is arranged between an internal thread and a coupling middle hole, and the inner thread, the coupling seal face and the coupling middle hole are respectivelyprovided with a coating. The coating is a mixed solution of polytetrafluoroethylene, aluminum oxide, copper oxide, titanium oxide TiO2 and a polymer phenolic resin organic binder. The coating method of the coating includes steps of pretreatment, surface cleaning, preheating, coating application, high temperature curing and the like. The corrosion-resistant alloy coupling has the advantages that the coating has protective and anti-thread-gluing functions, an existing corrosion-resistant alloy coupling copper plating process can be replaced, the environmental pollution problem of copper platingin production is solved by applying the coating technology, the phenomenon of oxidative discoloration of a copper layer is avoided in storage, and the anti-thread-gluing effect of the corrosion-resistant alloy coupling is better in screwing because that the coating itself has a lubricating function.