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一、概况建造一艘船舶,所用管道数量相当可观,万吨级船舶的管系长度可达30公里,其维修工作量约占船舶总维修工作量25%。海水对钢材的腐蚀本来就很严重,加上海水中的固体颗粒,增加了对钢管内壁磨损,沉积在管壁上便引起隙缝腐蚀。长期来,船舶管系采用增加壁厚或内壁镀锌来延长使用寿命,但是使用2～3年后就会产生内壁腐蚀并多处穿孔。为了解决海水对管壁的腐蚀与磨损,在钢管内壁涂敷一层塑料层,有很好的使用效果。
I. Overview To build a ship, the number of pipes used is considerable. The length of pipelines of 10,000-ton ships can reach 30 kilometers and the maintenance workload accounts for about 25% of the total maintenance workload of ships. Seawater on the corrosion of steel has always been very serious, coupled with the solid particles in the sea, an increase of wear on the inner wall of the pipe, deposited in the pipe wall will cause the gap corrosion. In the long term, the ship piping system will increase the service life by increasing the wall thickness or galvanization on the inner wall, but corrosion will occur on the inner wall after 2 to 3 years of use and multiple perforations will occur. In order to solve the corrosion and wear of seawater on the pipe wall, a plastic layer is coated on the inner wall of the steel pipe, which has good effect.