Causes and prevention of rusty manhole covers

Causes and prevention of rusting of manhole covers. What is the cause of rusting of manhole covers? When this happens, how should we solve it? The following Shandong manhole cover manufacturer will introduce you to the cause of rust. Please grasp it firmly.

1. There are chloride ions in the operating environment of the manhole cover: chloride ions are widespread, such as salt, sweat, sea water, etc. In the presence of chloride ions, the corrosion is very fast, even more than ordinary low carbon steel. Therefore, there are requirements for the use environment of the manhole cover, and it needs to be wiped frequently to remove dust and keep it clean and dry.

2. No solid solution treatment: the alloy elements are not dissolved into the matrix, resulting in low alloy content in the matrix structure and poor corrosion resistance. So everyone should pay attention to protective measures in this regard.

3. The manhole cover is inherently corroded by intergranular corrosion: This material without titanium and niobium has a tendency of intergranular corrosion. Adding titanium and niobium, together with stabilizing treatment, can reduce intergranular corrosion. A high-alloy steel that can resist corrosion in the air or in chemically corrosive media.

How to prevent the rust of the manhole cover is divided into two points:

1. Spray rust removal: When removing rust, be sure to remove all the rust, and remove all the oxides on the surface of the cast iron manhole cover. The power of air separated from oil and water is very large. There is sufficient friction between the air and the manhole cover. Instant cleaning. The advantages of this cleaning are that there is no need for a fixed location, high efficiency, large spray point flexibility, and no dead ends. Facilitate the adhesion of paint afterwards. Prevent rusting again.

2. Projectile rust removal: under the centrifugal action of high-speed rotation. The abrasive can wake up and clean the manhole cover with a larger friction area. The advantages of this method are high efficiency, good rust removal quality, and a slight reduction in the high power of workers. The important thing is that the air pollution is relatively low. Therefore, generally large manufacturers use this method to remove rust.

Regardless of which rust removal method is used, there is a certain degree of danger during operation. Please increase safety awareness and operate under the condition of ensuring personal safety.