Waterproof performance is an important indicator for judging the performance of natural ventilator. In addition, anti-corrosion ability is also an important indicator for judging the quality of natural vent. In the market, there are hot-dip galvanizing and electro-galvanizing methods for the surface treatment of natural roof ventilation. Please see the detailed explanation below.

The hot-dip galvanizing method is to melt the zinc ingot at high temperature, add some auxiliary materials to the zinc ingot, and then immerse the metal structure in the galvanizing tank to make the metal component adhere to a layer Zinc layer. Mcwell recommends hot-dip galvanizing. Hot-dip galvanizing is a better anti-corrosion treatment in general industrial environments.

Because the galvanizing amount can reach 275g/m2, the anti-corrosion life can be more than ten years or longer.

Mcwell used to recommend the overall hot dip galvanizing concept, which can avoid the corrosion weakness that the weld cannot be galvanized due to the straight pipe being plated and then welded. Now Mcwell recommends high-frequency hot-dip galvanizing for the welding seams. The anti-corrosion performance is same with hot-dip galvanizing, and it can avoid that the welded skeleton is too large to be immersed at one time, and more than two dipping will cause seam delamination problems and parts. The problem that the inside of the component cannot be fully galvanized.

Also known as cold galvanizing in the electro-galvanizing industry, it is the process of using electrolysis to form a uniform, dense, and well-bonded metal or alloy deposition layer on the surface of the part. The surface quality of electro-galvanized is brighter than that of hot-dip galvanizing, but its coating is only a few microns thick, and its corrosion resistance is poor, and it is often not as good as some paint anti-corrosion treatments. Mcwell do not recommend to use it.