Anti-corrosion Treatment Of Metal Welds

A lot of metal parts in use, according to the specific needs of the situation need to be welded, but the metal is welded with the corresponding weld, in order to prevent the normal use of the metal, we need to carry out the weld between the rust-proof treatment of the problem, according to the specific circumstances of the understanding of the following is the way to deal with the rust-proof metal weld.
1, pickling at the seam of the acid has not been neutralized or neutralization is incomplete, phosphating treatment into a film is incomplete and easy to rust. Rust spreads and overflows into the seam for a period of time after painting.
2,Strong acid pickling, strong alkaline degreasing treatment. Residual agents in the seam mutual neutralization and not washed clean. After drying, there is white product in the seam. After coating for a period of time, these white products are generated with the corrosive medium in the air. Chemical reaction with the corrosive medium in the air and overflow at the seam.

Solution to the problem.
1, degreasing must be used weak alkaline degreasing, can not contain flake components, TAL to be controlled at about 15 POINT, PH can not exceed 13.
2, pickling with sulfuric acid can also be used, pickling time can not be too long. It is better to use phosphoric acid.
3,After pickling, it is better to neutralize with 1~2 sodium carbonate.
4, surface adjustment is best to use oxalic acid, the use of concentration 1 ~ 2.
5, zinc phosphate treatment acidity to take the upper limit, impregnation concentration: TA: 35 or more, FA: 1.2AC: 8 (20CC fermentation tube).
6, each washing project must be clean, washing to maintain the overflow.