304 stainless steel thick-walled tube weld contrast before and after surface treatment and processing show that: this method can get rid of scale and temper color.When people raise the 304 stainless steel thick-walled tube surface oxide layer of chromium oxide content, the structure of the oxide layer after optimization, you can greatly improve the corrosion performance of 304 stainless steel thick-walled tube surface. By chemical treatment methods to achieve 304 stainless steel thick-walled tube to improve the corrosion resistance of the surface in two steps. Even 304 stainless steel thick-walled tube weld by this method can also be used to improve its corrosion resistance.
When the 304 stainless steel thick-walled tube surface corrosion resistance is not sufficient, This machine equipment and chemical suppliers developed technology to improve the nickel, molybdenum and chromium austenitic alloy material, thereby improving the corrosion resistance of 304 stainless steel thick-walled tube surface. Through two steps can be increased 304 stainless steel thick-walled tube surface oxide layer of corrosion resistance.
The first step in the use of water-based organic solution of 304 stainless steel thick-walled tube surface is surface-treated. This surface treatment will last 3 ~ 5h. During this time, remove the oxide layer from the surface of the part of the iron, with the reduction of iron, chromium and iron ratio increased from 6% to 8%, to an active role in improving the corrosion resistance has.
The second step to optimize the structure of the surface oxide layer. This further improves the corrosion resistance of the surface oxide layer. Affect the structure of the surface oxide layer is a heat treatment step of: according to the type of alloy and heat treatment of the crystal lattice of the object in air at 140 ℃ ~ 200 ℃ in.
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