A tin rust problem for help
Once the outer rust rust, if the area is not large, can use sandpaper to rub the rust, and then wipe clean towel can surface, then coated with a layer of antirust oil; if the outer rust area of about 1/2, we must take into account whether the corrosion to the inner wall, has affected the quality of the contents. If rust occurs on the inside, you need to remove all the rework, tank canning, liquid injection, degassing, sealing and sterilization, cooling, after 2 times of high temperature sterilization of canned products, generally need to downgrade, or if some products in the two sterilization will appear after taste and color changes, you need to direct rejection.
In addition, if the contents of the broth salinity is too high, pH is too low or too high, are prone to corrosion cans, rust occurs.
In production, if the sealing force is too large, it is easy to damage the tank, scraping the coating, resulting in rust.
If the cooling water contains more impurities and negative ions, the sterilization process will lead to an electrochemical reaction. The impurity anion will form a galvanic cell between the Fe at the damage of the coating of the tank, which will lead to rust.
The rusty cans, the best prevention is to use empty cans of good quality, ensure the tank, the outer wall of the antirust paint, coating thickness and curing degree basically no problem, pay special attention to the weld coating is complete. Choosing a good supplier and improving the inspection of empty cans are very important.
