Corrosion causes various accidents and major disasters. Due to the corrosion of steel pipelines and equipment, the production enterprises stopped production and the product quality decreased. It affects the domestic supply, gas supply, heating steam or hot water, and brings many difficulties to people's life. The leakage of buried oil, gas, water and other pipelines and pipe networks, and the running, emitting and dripping of enterprises' oil refining, chemical, chemical fiber, chemical fertilizer, pharmaceutical and other pipelines and equipment, in addition to the loss of a large number of useful substances, cause serious environmental pollution, and even cause catastrophic accidents such as fire, explosion and collapse. In view of the prevalence of metal corrosion, in order to prevent or slow down the occurrence of metal corrosion, various metal anti-corrosion technologies and processes came into being. The promotion and application of new metal anti-corrosion processes, new materials and new equipment can prolong the service life of pipeline equipment, save funds and ensure safe production. In China's petrochemical, public utilities and other industries, the pipeline has been perforated for 20000 times / year due to corrosion, which mainly occurs at the interface of the steel pipe and the pipeline itself.
