Strictly speaking, stainless steel pipes and carbon steel pipes cannot be stacked together, because the data of carbon steel pipes and stainless steel pipes are different. In a humid environment, it is assumed that it is very simple to stack carbon steel pipes and stainless steel pipes together, resulting in chemical reaction, and then damage the protective layer of stainless steel pipes, resulting in rust of stainless steel pipes. If different steels are stacked together and contacted, potential difference will occur, resulting in electrochemical corrosion, especially when there is ponding, the electrochemical corrosion rate between stainless steel pipe and carbon steel pipe will be accelerated.

　　Just like the principle of a battery, in a chemical battery, chemical energy is directly converted into electrical energy because of the oxidation recovery reaction inside the battery. In order to prevent electrochemical corrosion and carburization of stainless steel pipe, it is best not to pile them together. However, carburization will not occur immediately when carbon steel and stainless steel are in contact at room temperature. There is a specific cycle for colorful corrosion on stainless steel pipes.

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