Causes and hazards of corrosion Oil and gas pipelines, pipelines for hazardous chemicals in refineries, storage tanks, etc. will be accompanied by corrosive substances such as sulfides, water-soluble acids, and water-soluble alkalis during use. In the process of production, processing and transportation, the production equipment and transportation pipelines are corroded. Mainly occur in low-temperature parts leak corrosion, high-temperature parts sulfur corrosion, and high-temperature parts naphthenic acid corrosion, which seriously affects the safety of the device, and even causes serious economic and social impacts; lack of long-term effective online inspection of on-site equipment and pipelines It is difficult to predict the risks of existing pipelines by using data analysis to predict the life of pipelines; the intervals between overhauls are too long, and it is difficult to measure the regular corrosion of overhead pipelines. Therefore, a device capable of online corrosion monitoring of pipelines is required.