Traditional coatings have many defects in the application of pipeline internal corrosion protection and the problem of inner joint wrap has not been solved till now.
传统涂料在管道内防腐的应用上存在着许多缺陷，而且内补口问题始终没得到解决。
The two special cement coatings are applicable to sewage pipeline internal corrosion for ductile iron pipe, improve the ability to resist the erosion of acid components in sewage.
这两种特殊水泥涂层均适用于污水管道用球墨铸铁管的内防腐，提高抵抗污水中酸碱成分的侵蚀能力。
When corrosion mechanism was studied for internal corrosion of gas pipeline, internal corrosion degree of pipeline should be evaluated.
当研究天然气管道内腐蚀机理时，有必要对管道进行内腐蚀程度的评价。
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