Pickling and passivation of stainless steel pipe
Pickling and passivation are two types of stainless steel pipe processing and are chemical processes for removing the oxidation of the stainless steel pipe surface.
Purpose: Fully pickling and passivation of stainless steel pipe to remove all kinds of dirt, rust, oxide scale, welding spot and other dirt. After treatment, stainless steel pipe surface becomes uniform silver white, greatly improving the corrosion resistance of stainless steel pipe, suitable for various materials Stainless steel tubes (TP304, TP316, TP316L, TP310S, etc.).
Usage: Stainless steel pipe pickling passivation is generally used pickling passivation paste and pickling passivation solution for processing, according to the stainless steel pipe material and oxide scale severity, you can use the original solution or add 1:1 to 4 ratio of water Used after dilution; austenitic stainless steel with low content of ferrite, martensite, and nickel (such as 420, 430, 200, 201, 202, 300, 301, etc.) is used after dilution, and austenitic stainless steel with high nickel content is used. (such as 304, 321, 316, 316L, etc.) soaked with liquid; generally used at room temperature or heated to 15 to 30 degrees, soak 5-15 minutes or more (specific time and temperature users determine according to their own trial conditions), To the surface dirt completely removed, into a uniform silvery white, forming a uniform and dense passivation film, removed after processing is completed, rinse with water, preferably with alkaline water or lime water rinse and neutralization.
Pickling and passivation are widely used for rust and spot welding of SUS300 series austenitic stainless steels (SUS303, 304, 316, 316L, etc.) and duplex stainless steels SUS201, 202, 204, etc. during forming, assembly, welding, etc. The removal of oil, oil, black and yellow oxide scales and simultaneous full passivation of stainless steel workpieces greatly improves the corrosion resistance of stainless steel workpieces. Really achieve the effect of pickling and passivation.
After the stainless steel tube pickling passivation solution ZJ-302 treated stainless steel tube will produce a bright beautiful silver-white passivation film. The passivation film is compact and beautiful, and the corrosion potential can be increased by more than 500mV.
Features: Easy to operate, easy to use, economical and practical. At the same time, it has added high-efficiency corrosion inhibitors and anti-fogging agents to prevent over-corrosion and hydrogen embrittlement of stainless steel pipes and to suppress the generation of acid mist.