the reason of defect generation is local spot corrosion due to contact with the corrosive medium in the transportation and storage.
产生缺陷的原因是运输、储存过程中与腐蚀性介质接触造成钢管局部点腐蚀。
after studying the situations of local and spot corrosion to ship's hull and pipelines, the paper proposed the method to repair and strengthen the elements by using the composite materials.
本文从舰船船体、管系局部及坑点腐蚀的实际情况出发,提出用复合材料进行修理加强的方法。
the causes of spot corrosion of blast furnace charging reducer gear are analyzed. rational selection of lubricant oil for equipment is put forward to decrease wear for gear and prolong its life.