彩钢卷金属腐蚀原理以及防腐处理

金属材料的损伤主要有三种形式：断裂、磨损和腐蚀。在这三种形式中，腐蚀是对金属最复杂和破坏性最大的。由于金属腐蚀发生在金属与环境（介质）的同一界面上，并产生化学或电化学反应，因此金属防腐研究是其他材料防腐研究中较为困难的一个。

The damage of metal materials is mainly in three forms: fracture, wear and corrosion. Among the three forms, corrosion is the most complex and destructive to metal. Because metal corrosion occurs at the same interface between metal and environment (medium), and produces chemical or electrochemical reaction, the research on metal anti-corrosion is a more difficult one in the research of anti-corrosion of other materials.

The corrosion classification of metal material family usually includes the following sub categories:
(1) According to corrosion environment: dry corrosion and wet corrosion;
(2) According to the corrosion mechanism: chemical corrosion, electrochemical corrosion and physical corrosion;
(3) According to the type of corrosion form: pitting corrosion, stress corrosion fracture;
(4) Metal matrials: common and practical metals in the "metal manual".
(5) According to the scope of application: it is actually a special application classified according to the corrosive environment.
The anti-corrosion phenomenon of metals mainly refers to points (1) and (2) mentioned above. The dry corrosion in point (1) belongs to the chemical mechanism, while the wet corrosion belongs to the electrochemical mechanism. Points (3) to (5) belong to the further classification of points (1) and (2). The anti-corrosion mechanism of color coated plate is to isolate the substrate from the corrosion medium by coating, Prevent chemical or electrochemical reactions on the substrate surface. Therefore, the anti-corrosion problem we finally studied should be classified as chemical corrosion and telephone corrosion on the surface of coated steel plate substrate.
Based on the abov metal corrosion mechanism, people have been looking for effective metal corrosion control methods. After long-term practice, the following measures have been basically formed;
(1) When selecting metal materials, select those resistant to atmospheric corrosion as far as possible;
(2) During structural design, try to avoid cracks, pits and other places that are easy to accumulate water and cause corrosion, which should be fracture;
(3) Change the composition and add corrosion inhibitor to inhibit the corrosion process;
(4) Rust proof treatment shall be conducted before packaging. Keep dry and clean during storage:
(5) Adopt surface protective covering coating;