一种增材制造钛合金活塞杆局部镀铬方法，活塞杆包括大端A、杆部B、螺纹段C，包括以下步骤，第一次安装：将第一紧密覆盖组件覆盖所述杆部表面及其与螺纹段所连接的端面，将第二紧密覆盖组件覆盖所述螺纹段的表面，将第三紧密覆盖组件覆盖所述大端的凹槽及所述大端与所述杆部所连接的端面；第一次镀铬：将所述活塞 杆大端放入到镀铬液中进行电镀铬工艺，所述电镀铬工艺参数为：加热镀铬液至65‑75℃，pH2.5-3.5、电流密度16‑18A/dm²；拆卸：将所述第一紧密覆盖组件拆卸下来；第二次安装：将第四紧密覆盖组件覆盖所述大端表面；第二次镀铬：将所述杆部B放入到镀铬液中进行电镀铬工艺，所述电镀铬工艺参数为：加热镀铬液至65‑75℃，pH2.5‑3.5、电流密度16‑18A/dm²。

A method for locally chrome plating titanium alloy piston rods by additive manufacturing, wherein the piston rod comprises a large end A, a rod portion B, and a threaded section C, comprising the following steps: first installation: covering the surface of the rod portion and the end face connected to the threaded section with a first tightly covering component, covering the surface of the threaded section with a second tightly covering component, and covering the groove of the large end and the end face connected to the rod portion with a third tightly covering component; First chrome plating: Place the large end of the piston rod into the chrome plating solution for chrome plating process. The chrome plating process parameters are: heat the chrome plating solution to 65-75 ℃, pH 2.5-3.5, and current density of 16-18A/dm²; Disassembly: Remove the first tightly covered component; Second installation: Cover the surface of the large end with the fourth tightly covered component; Second chrome plating: Place the rod B into the chrome plating solution for chrome plating process. The chrome plating process parameters are: heat the chrome plating solution to 65-75 ℃, pH 2.5-3.5, and current density 16-18A/dm².