The decription of Galvanized alloy ingot

Galvanized alloy ingot
Galvanized alloy ingots than significant, casting properties can be die-casting of complex shape, thin-walled precision, smooth casting surface. Surface treatment: electroplating, painting, painting. Melting and die casting when iron absorption, corrosion-pressure, non-stick mode. Good room temperature mechanical properties and wear resistance. Low melting point, melting at 385 ℃, easily Die Casting, in the presence of water vapor (electrolyte) to promote intergranular electrochemical corrosion.
Zinc soluble in acid, can also be dissolved in alkali, and therefore call it the amphoteric metal. Zinc in the dry air is almost no change. In humid air, the zinc surface will generate a dense film of basic zinc carbonate. Containing sulfur dioxide, hydrogen sulfide and marine atmosphere, the poor corrosion resistance of zinc, especially in hot and humid atmosphere containing organic acids, the zinc coating can easily be corrosion. Zinc standard electrode potential of-0.76V, the steel substrate, the zinc coating is anodic coating, which is used to prevent the corrosion of iron and steel, the pros and cons of its protective properties of coating thickness relationship is great. Zinc coating, passivation, staining or coating retaining light agent, can significantly improve the protective and decorative.
The plating bath containing zinc plating solution, after cleaning and special pretreatment to be plated as a cathode, made ​​of metal plating anodes, the two poles with the positive and negative terminals of the DC power connection. Liquid compounds containing metal plating, conductive aqueous solution of salts, buffers, pH modifiers and additives such as galvanized. Energized, the metal ions in the zinc plating solution, the potential difference to move to form a coating on the cathode. The anode metal to the formation of metal ions into the zinc plating solution in order to maintain the concentration of the plating metal ions . In some cases, such as chrome-plated, is the use of lead, lead-antimony alloy insoluble anode, it is only since the transmission of electronic conduction current role. Concentration of chromium ions in the electrolyte, the need to rely on to join the chromium compounds to the bath on a regular basis to maintain. Galvanized, the quality of the anode material, zinc plating solution composition, temperature, current density, power-on time, stirring intensity, precipitation of impurities, the power waveform will affect the coating quality, timely control.
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