The box type structure, cavity cannot antirust paint corrosion, in order to prevent moisture intrusion corrosion beam cavity, sealing the inner cavity of the main girder must keep.
箱型结构的主梁，内腔无法涂漆防锈蚀，为了防止水汽侵入腐蚀主梁内腔，必须保住主梁内腔的密封性。
2
The flow structure displayed a reverse jet current in the lateral cavity and white corrosion on the lateral enlargement surface.
试验细部结构特征，发现侧空腔内的反射回漩流和突扩弧形面上的白色蚀带。
3
But for the product with high precision, surface roughness, adopt the high power density of long time cleaning will have "cavity" corrosion on the surface of the product.