On the road above, we often see the ductile iron manhole cover rust phenomenon, this is a normal thing, but it will reduce the life of nodular cast iron manhole cover, so we should as soon as possible will be above the rust clean。
We can put the rusty ductile iron manhole cover first removed, replaced by a new ductile iron manhole cover, so that will win the ball cover with salt water clean, so it can make the oxide cleaning clean, then put in dry air, the water clean all know, we can the above spray a layer of paint, it can prolong the time of rust.
In addition, we can also use the method to remove the above cast iron, this approach is more environmentally friendly, but more investment, and is a dangerous approach.
In general, if it is important, straight steel pipe company said, you can use this way to deal with rust, but in the operation, we should pay attention to safe operation, improve their safety awareness.
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