The purpose of both cold galvanizing and hot galvanizing for garden light manufacturers is to prevent corrosion and prolong the service life of street lamps. However, compared with cold galvanizing, hot galvanizing is more effective in preventing corrosion.
First of all, the process difference:
Cold galvanizing, also called electricity galvanized, is the use of electrolytic equipment the workpiece after degreasing, pickling into the composition of zinc salt in the solution, and connect the cathode electrolytic equipment, placed in the workpiece on the opposite side of zinc plate connected to the anode electrolytic equipment, connected to the power supply, use current from the positive to the negative directional move, will deposits a layer of zinc on the workpiece;
Hot-dip galvanizing is the workpiece in addition to oil, pickling, soaking, drying after immersion in the dissolved zinc solution for a certain time, can be put out.
Differences in the appearance of garden lights:
The appearance of electrogalvanizing is smooth and bright, and the electroplating layer using color passivation process is also yellow-green and colorful. The electroplating 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 sunlight. The corner edge of the complex workpiece is easy to produce "electric firing" and become gray, and the zinc layer of this part is thicker. It is easy to form the current dead Angle in the negative corner and produce the dark area of undercurrent. The zinc layer in this area is thinner. The whole workpiece has no zinc tumor, caking and other phenomena.
The appearance of hot dip galvanizing is slightly rough than that of electric galvanizing, and it is silver-white. The appearance is easy to produce process water lines and a few droplet nodules, especially at one end of the workpiece. But 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 higher than that of electric galvanizing.