Passivation process of carbon steel tee can be divided into many types, including wet process and dry process. The iron oxide formed on the ordinary carbon steel continues to oxidize, which makes the corrosion expand and finally forms holes. The carbon steel surface can be guaranteed by painting or electroplating on oxidation resistant metals (e.g., zinc, nickel and chromium), but, as is known, this protection is only a thin film. If the cover is damaged, the underlying steel begins to rust.
The passivation effect of carbon steel tee depends not only on the passivation process, but also on the stainless steel stamping elbow material itself. The specific influencing factors include the elements contained in stainless steel stamping elbow, stainless steel metallographic structure, stainless steel processing state, etc. Among the constituent elements, chromium and nickel are the elements with strong passivation, followed by iron. Therefore, the higher the content of chromium and nickel, the stronger the passivation of stainless steel.
Austenitic and ferritic stainless steel stamping elbow has uniform structure and good passivation. Martensitic stainless steel is strengthened by heat treatment, and its metallographic structure is multiphase structure, so its passivation is not strong. After machining, the smooth surface of carbon steel tee has good passivation, while the surface of workpiece obtained by casting and sandblasting is rough and dry, which is not conducive to passivation. Carbon steel tee will not produce corrosion, pitting, corrosion or wear. Stainless steel is also one of the strongest metal materials used in construction.