Hot-dip galvanized emt conduit pipe is a metal threading pipe that has been hot-dip galvanized.
Hot-dip galvanized pipe is to make the molten metal and the iron matrix react to produce an alloy layer, so that the matrix and the coating are combined. Hot-dip galvanizing is to first pickle the steel pipe. In order to remove the iron oxide on the surface of the emt conduit, after the pickling, it is cleaned in a tank with ammonium chloride or zinc chloride aqueous solution or a mixed aqueous solution of ammonium chloride and zinc chloride, and then sent to In the hot dip plating tank. Hot-dip galvanizing has the advantages of uniform coating, strong adhesion and long service life. Complicated physical and chemical reactions occur between the emt conduit matrix and the molten plating solution to form a corrosion-resistant zinc-iron alloy layer with a compact structure. The alloy layer is integrated with the pure zinc layer and the steel pipe matrix. Therefore, its corrosion resistance is strong.
1. The uniformity of the galvanized layer: the emt conduit sample shall not turn red (copper-plated color) after being immersed in copper sulfate solution for 5 consecutive times
2. Surface quality: The surface of the galvanized steel pipe should have a complete galvanized layer, and there must be no unplated black spots and bubbles. Small rough surfaces and local zinc tumors are allowed.
3. Galvanized layer weight: According to the requirements of the buyer, the galvanized steel pipe can be used to determine the weight of the zinc layer. The average value should not be less than 500g/square meter, and any sample must not be less than 480g/square meter.