What are the requirements for pickling of stainless steel heat exchange tubes??

First of all, we need to understand the use of pickling: the comprehensive pickling passivation of stainless steel, remove all kinds of oil, rust, oxide skin, welding spots and other dirt, after treatment, the surface becomes uniform silver white, greatly improve the corrosion resistance of stainless steel, suitable for all types of stainless steel parts, plates and equipment.

Once again, we need to understand the use of pickling: according to the stainless steel material and the severity of the oxide scale, you can use the original liquid or dilute with water in a ratio of 1:1 ~4; Ferrite, martensite and austenitic stainless steel with low nickel content (such as 420, 430, 200, 201, 202, 300, 301, etc.) are used after dilution, and austenitic stainless steel with high nickel content (such as 304, 321, 316, 316L, etc.) is soaked in the original solution; Commonly used after normal temperature or heating to 50 ~ 60 degrees, immerse 3-20 minutes or longer (specific time and temperature users according to their own trial conditions), to the surface completely remove dirt, into a uniform silvery white, and the passivation film forming uniform, take out after processing is completed, rinse off with clear water, best to use alkaline or flush and whitewash.

Finally, we need to know what pickling is: it usually refers to a method of cleaning metal surfaces.