如果地形上只有几个钉子洞，彩钢板的腐蚀速度不快。下图显示的是在未对钉孔进行所有处理的情况下，彩钢瓦腐蚀造成的损坏。虽然不是很明显，但在猪舍这种腐蚀性的地理环境中，我们不需要冒险。

2、 锈蚀损伤

If there are only a few nail holes in the landform, the corrosion rate of color steel tile is not fast. The following photo shows the damage to the color steel tile corrosion without doing all the treatment for the nail hole. Although it is not very obvious, we don't need to take chances in the corrosive geographical environment of pig house.

2、 Rust damage
In short, rust damage is mainly caused by rusty iron castings, such as rusty steel nails and iron wires falling on the surface of color coated thick steel plate, and the damage caused by coating on the surface of color coated thick steel plate after a period of time. Rust is simultaneous interpreting iron castings as infectious diseases. It is because rust is honeycomb like and easy to digest water, and rust after digestion will speed up the corrosion of iron castings. The following picture shows that the corrosion of cast iron is adhered to the color coated thick steel plate, which leads to the corrosion of color coated coil thick steel plate.
The overhanging structure (①, ②, ④) and color coated thick steel plate (③) in the above photos are hot-dip galvanized parts. It is helpful to master the difficulties later by marking the reasons for their current situation. At first, ① and ② are arc welding welding welding points, all of which are corrosion caused by arc welding. ① It is convenient to fix two hot-dip galvanized C-section steel purlins to the same welding work; ② it is convenient to weld a piece of galvanized steel plate outside for unique and closed type, which is caused by the two kinds of work The hot-dip galvanizing coating of prefabricated components was damaged, and the corrosion of one was slow due to small damage surface (①) and fast corrosion due to large damage surface (②).
By the way, at that time, after the completion of arc welding, a layer of cool water paint should be painted and a layer of silver paint should be applied to avoid the contact between the welding position and the steam body, which can reduce the corrosion. ——When the corrosion at position (2) begins to spread outside, it will "sense" the color coated thick steel plate that contacts with it. When the hot-dip galvanized layer of the color coated thick steel plate is damaged, the corrosion will occur (3). When the rust water of color coated thick steel plate (3) drips down again, it will "feel" on the hot-dip galvanized C-section steel purlin, causing the corrosion again