What is the difference between hot galvanizing and cold galvanizing?

First of all, it is different from the process: cold galvanizing, also known as electric galvanizing, is the use of electrolytic equipment to remove oil and pickle the workpiece into the solution of zinc salt, and connect the negative electrode of the electrolytic equipment; A zinc plate is placed on the opposite side of the workpiece and connected to the positive electrode of the electrolytic device, the power supply is switched on, and a layer of zinc is deposited on the workpiece by the directional movement of the current from the positive electrode to the negative electrode. However, hot-dip galvanizing is to remove oil from the workpiece, pickling, dipping, drying after dipping into the dissolved zinc solution for a certain time, and then bring it out.

Then it is different from the appearance: the appearance of electric galvanized is smooth and bright, and the electroplating using the color passivation process is also yellow-green as the main color, which is colorful. The coating with white passivation process is bluish white or white is green, and the coating with white passivation process is slightly colorful at a certain Angle with the sunlight. In the corner of the complex workpiece, it is easy to produce "electric burning" and gray, and the zinc layer in this part is thicker. It is easy to form a dead current Angle in the negative corner, resulting in an undercurrent gray area, where the zinc layer is thin. The whole workpiece has no zinc nodules, caking and other phenomena. The appearance of hot-dip galvanizing is slightly rougher than that of electric galvanizing, silver-white, and the appearance is easy to produce process water marks and a little drip nodules, especially at one end of the workpiece. However, the zinc layer of hot dip galvanizing is dozens of times thicker than that of electric galvanizing, and the corrosion resistance is dozens of times that of electric galvanizing.