National standard regulations for galvanized layer of bridges

The national standard regulations for the galvanized layer of hot-dip galvanized bridges comply with the following requirements:

1. Zinc layer thickness: The thickness of the galvanized layer of hot-dip galvanized bridges should comply with national standards. Generally speaking, the thickness of the galvanized layer of hot-dip galvanized bridges used indoors should not be less than 12 μm. The thickness of the galvanized layer of hot-dip galvanized bridges used outdoors should be The thickness of the zinc layer should be no less than 65μm. 2. Zinc layer quality: The galvanized layer of the hot-dip galvanized bridge should be uniform, bright, without defects such as peeling, pitting, pores, etc., and should not have obvious black spots, white frost, etc.

3. Adhesion of galvanized layer: The adhesion between the galvanized layer of the hot-dip galvanized bridge and the base material should meet the requirements of national standards. Generally, a cross-hatch test or a skimming test is used to detect the adhesion between the galvanized layer and the base material. Adhesion.

4. Uniformity of the zinc layer: The zinc layer of the hot-dip galvanized bridge should be evenly distributed on the entire surface, and there should be no obvious local excessive thickness or thinness. 5. Surface treatment: The surface of the galvanized layer of the hot-dip galvanized bridge should be flat and smooth, without obvious unevenness, scratches and other defects.

6. Color of the galvanized layer: The color of the galvanized layer of the hot-dip galvanized bridge should be uniform, usually showing silver gray or light blue.

In short, the national standard regulations for the galvanized layer of hot-dip galvanized bridges mainly cover the requirements for galvanized layer thickness, quality, adhesion, uniformity, surface treatment and color. These regulations are intended to ensure that hot-dip galvanized cable trays have good corrosion resistance and service life, and meet relevant engineering and safety requirements.