1. The main causes of abnormal corrosion or perforation in plain iron cans:
A. Tinplate has low tin plating and causes severe corrosion.
B. The low degree of passivation of tinplate produces localized corrosion;
C. Severe damage to the tin layer and low vacuum in the tank cause concentrated corrosion;
D. The content of acidity is too low to cause local corrosion;
E. The content of sulfur dioxide in the content is high in acidic foods to promote iron dissolution and spot corrosion and perforation;
F, raw material or canned water with high nitrate content produces abnormal tin removal.
2. The main causes of diffusion corrosion, sulfide corrosion, or perforation in paint cans:
A, passivation of tinplate surface;
B. Easy to use the lid material and coating type;
C. Inappropriate coating iron processing;
D. The content of sulfur dioxide in canned fruit is high;
E. The coating film is seriously damaged during the canning process;
F, improper seal damage the full open cover rivets;
G, raw materials are not fresh or rinse is not clean.