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保温钢管是经过保温工艺加工处理后，在不同工作环境和外介质的作用下保证工作钢管内温度与表面温度符合或达到使用要求的钢制管道。
Thermal insulation steel pipe is a kind of steel pipe which can ensure the internal temperature and surface temperature of working steel pipe meet or meet the requirements of use under the effect of different working environment and external media after heat preservation processing.
直埋保温管道阴极保护是金属防腐过程中的一种电化学保护方法，与直接埋地绝缘管的其它防腐技术不同，通过在保护金属体内施加电流，保护金属体的电极电位负移动。这是金属从原子态向离子态自发转变的趋势，从而从根本上抑制了腐朽的产生，但该工艺必须在电解液中进行，因此非常适用于埋地钢管的阴极保护。
Cathodic protection of directly buried insulated pipeline is an electrochemical protection method in the process of metal anti-corrosion. Different from other anti-corrosion technologies of directly buried insulated pipe, the negative electrode potential movement of metal body is protected by applying current in the protected metal body. This is the spontaneous transformation of metal from atomic state to ionic state, which fundamentally inhibits the generation of decay. However, this process must be carried out in electrolyte, so it is very suitable for cathodic protection of buried steel pipes.