What are the significant advantages of ductile iron manhole covers?
2020-01-02
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What causes the rust of the manhole cover? How to prevent it
- Categories:Common problem
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- Time of issue:2020-01-04
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(Summary description)The rust phenomenon of the manhole cover, how should we solve it, the following ductile iron manhole cover will introduce you to the knowledge of the causes of rust, please grasp it firmly.
What causes the rust of the manhole cover? How to prevent it
(Summary description)The rust phenomenon of the manhole cover, how should we solve it, the following ductile iron manhole cover will introduce you to the knowledge of the causes of rust, please grasp it firmly.
- Categories:Common problem
- Author:
- Origin:
- Time of issue:2020-01-04
- Views:3
Information
The rust phenomenon of the manhole cover, how should we solve it, the following ductile iron manhole cover will introduce you to the knowledge of the causes of rust, please grasp it firmly.
1. Chloride ions exist in the operating environment of the manhole cover: Chloride ions are widespread, such as salt, sweat stains, sea water, etc. In the presence of chloride ions, the corrosion is very fast, even more than that of 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. Without solution treatment: the alloying 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 naturally corroded by intergranular corrosion: this material without titanium and niobium has a tendency of intergranular corrosion. Adding titanium and niobium, together with stabilization treatment, can reduce intergranular corrosion. A high-alloy steel that can resist corrosion in the air or in chemically corrosive media.
Solution to rust of ductile iron manhole cover
1. Spray rust removal: When removing rust, all rust must be removed, and all oxides on the surface of the cast iron manhole cover must be removed. When the air pressure is 4-0.6Mpa. The power of the 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 it does not require a fixed location, is high in efficiency, has great flexibility in spraying points, and has 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. No matter 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.
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