In order to remove surface film, surface inclusion and other defects locally on the surface of the deposited layer, the large coil galvanized wire can be found and treated by conventional technology. Excess foam is caused by the surfactant of soap and saponifiable fats being brought into the tank. A moderate rate of foam formation may be harmless. Small homogeneous particles of large denier present in the tank can stabilize the foam layer, but the accumulation of too many solid particles will cause explosion.
Mat with activated carbon to remove surface active substances. Or through filtration to make the foam less stable, which are effective measures, other measures should also be taken to reduce the amount of surface active substances, the introduction of organic matter can significantly reduce the plating speed. Although the chemical formulation is conducive to a high deposition rate, the thickness of the coating cannot meet the requirements after the organic matter is brought in, so activated carbon can be used to treat the bath.
Zinc is a silver-white metal, brittle at room temperature, easily soluble in acid and alkali, known as amphoteric metal. Pure zinc is more stable in dry air, small in humid air or water containing carbon dioxide and oxygen, and a thin film layer based on basic zinc carbonate will be generated on the surface, which can delay the corrosion rate of the zinc layer. The corrosion resistance of galvanized layer in aqueous solution of acid, alkali and sodium chloride is very good.
It is also not resistant to corrosion in atmospheres containing carbon dioxide and hydrogen sulfide and in Marine atmospheres; In the high temperature and high humidity air and the atmosphere containing organic acids is small, the galvanized layer is also easy to be corroded. Galvanized iron wire is more common in life, it is widely used in construction, guardrail, hook mesh, product packaging and other fields, but after a long time of use, sometimes you will find that galvanized iron wire has turned black.
Galvanized iron wire blackening can be effectively prevented, such as: the work site to keep dry, reduce and do not use chemicals, operators with clean gloves. In addition, it is required that the hot dipping zinc factory must be passivated after zinc dipping, and the passivated zinc has a better anti-discoloration effect, which can effectively extend the discoloration time, and the combination of the two should be able to solve the discoloration. Galvanized iron wire has good toughness and elasticity, and the zinc content can reach 300 grams/square meter. It has the characteristics of thick galvanized layer and strong corrosion resistance.
Post time: 14-12-23