Two Steel Structure Corrosion Cases
Steel structure surface treatment is a very important part.
It was observed that the corrosion of the steel structure increased exponentially at an increasing rate each year. In the first year, it is a spotted rust point, and then a rust bubble is formed. After the bubble bursts in the second year, it begins to erode in the depth under the urging of the external medium, and then the coating begins to fall off with the iron oxide. The following table lists the annual corrosion situation of a steel structure factory building due to the incomplete rust removal at that time, and the corrosion prevention and maintenance of the steel structure was not seriously damaged in l0 years.
|
|
|
Usage of year
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Corrosion
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Thickness(mm)
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|
First year
|
Spotted spot
|
0
|
|
Second years
|
Rust point bubbles,
A little of oxide layer falling off
|
0.01
|
|
Third Years
|
A lot of layer shedding
|
0.03
|
|
Fourth Years
|
oxide layer shedding
|
0.07
|
|
Fifth Years
|
oxide layer shedding
|
0.12
|
|
Sixth Years
|
oxide layer shedding
|
0.35
|
|
Seventh Years
|
oxide layer shedding
|
0.60
|
|
Eighth Years
|
oxide layer shedding
|
0.85
|
|
Ninth Years
|
oxide layer shedding
|
1.10
|
|
Tenth Years
|
oxide layer shedding
|
1.52
|
|
|
In 1994, a road bridge collapse accident in South Korea caused many people to die. The bridge was built in 1979. No weld cracks were found in many inspections, but a large range of rust was found on the fracture surface of the bridge. There are 600,000 highway bridges in the United States, half of which need to be repaired due to steel corrosion. This shows how important long-term protection for large steel structures.
Hot-dip galvanized surface treatment guarantees the quality of the main steel structure for 50 years。 |
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