Is it necessary to spray anti-rust paint on the outer layer of galvanized pipes? How effective is it? Friends who understand the principle can tell me that it can be used outdoors!

1. When used outdoors, it is absolutely necessary to spray anti-rust paint, especially where the galvanized layer is damaged at the joints of galvanized pipes and where tools are used.

2. Zinc can prevent oxidation at room temperature. Zinc alloy plates can be used directly as roof covering materials. Their service life can be as long as 120-140 years and can be recycled. However, galvanized iron plates can be used as roof covering materials. The service life of materials is generally 5-10 years.