How to pre-treat the surface of 304 stainless steel pipe?
How to pre-treat the surface of 304 stainless steel pipe
1, shot peening before rust removal, should preheat 304 stainless steel pipe, remove moisture, preheating temperature of 40℃ ~ 60℃; 2, rust removal should reach GB/T8923 "Steel surface corrosion grade and rust removal grade" Sa2.5, 304 stainless steel pipe surface anchor grain depth of 40μm ~ 100μm; 3, 304 stainless steel pipe surface
1, shot peening before rust removal, should preheat 304 stainless steel pipe, remove moisture, preheating temperature of 40℃ ~ 60℃;
2, rust removal should reach GB/T8923 "Steel surface corrosion grade and rust removal grade" Sa2.5, 304 stainless steel pipe surface anchor grain depth of 40μm ~ 100μm;
3, 304 stainless steel pipe surface residual rust dust should be removed;
4. Spraying should be carried out within 4h after surface pretreatment.
In addition, the methods of galvanized 304 stainless steel pipe surface mainly include hot dip galvanizing and electric galvanizing, hot dip galvanizing has wet method, dry method, lead zinc method, REDOX method and so on.
The main difference between different methods of galvanized hot dip galvanizing is what method is used to activate the surface of the 304 stainless steel pipe to improve the quality of galvanized steel. At present, the dry method and REDOX method are mainly used in production.
The surface of zinc layer is smooth and compact with uniform structure. Good mechanical properties and corrosion resistance; The zinc consumption is 60% ~ 75% lower than that of hot dip galvanizing. Electrogalvanizing has a certain complexity in technology, but this method must be used for single-sided coating, double-sided coating with different thickness of internal and external surface coating, and galvanized 304 stainless steel pipe.
