The surface can be treated with galvanization, electrolyse, plastic spray and porcelain enamel for different application situation.

表面可电镀、电解、喷塑、搪瓷，以适应不同场合的需要。

The basic theory and process for machining marks (code) on the outer wall of pipe with electrolyse-jet are introduced.

采用电解一流加工法在壁表面加工标记（号）的基本原理及其过程，通过实验总结出较为合理的工艺规范。