Reasons And Solutions For Copper Heads

In Enamel Cookware

The copper head is one of the common defects of enamel firing. It is manifested as brown-red spots on the enamel surface after firing. The size is generally 0.5~1 mm, and the maximum is 3 mm.

There are many reasons for the appearance of copper heads. The following is an analysis of several high-incidence reasons:

1. The carbon content of the thin steel plate is high;

2. Dirty pickling or incomplete neutralization of iron billet

3. The fluidity of the fired ground coat is small, and the solubility of iron oxide is small.

4. The firing furnace temperature is too low, the products in the furnace are too densely arranged, and the heating is uneven


1. Select high-quality steel sheets with low carbon content;

2. The pickling should be clean, the neutralization should be sufficient, and the drying should be fast to prevent the iron billet from rusting;

3. Adjust the viscosity of the ground coat to increase the solubility of Fe2O3;

4. The enamel should not be too thin, the firing temperature should be appropriately increased, and the product arrangement gap should be increased.