为了防止气体对钻杆的腐蚀，延长钻杆的使用寿命，公司还可以为钻杆涂敷内涂层，进行TK34、TK34P、DPC以及TC2000系列等防腐材料的钻杆内壁涂层。
        In order to avoid gas corrosion and to extend service life, PDM can provides all kinds of inner plastic coating for drill pipes, such as TK34, TK34P, DPC or TC2000.etc.