Characteristics of cadmium electroplating<br>Cadmium coating is relatively stable and corrosion-resistant for parts in contact with marine atmosphere or seawater and hot water above 70 ℃, so cadmium plating is often used in marine environment. Cadmium coating is relatively stable and corrosion-resistant for parts in contact with marine atmosphere or seawater and hot water above 70 ℃, so cadmium plating is commonly used in marine environment.<br>Cadmium is a silver white plastic metal. Cadmium is a silver white plastic metal. Cadmium metals are easy to forge and roll. Cadmium metals are easy to forge and roll. The relative atomic mass of cadmium is 112.41, the density is 8.65g/cm 3, the melting point is 320.9 ℃, and the boiling point is 767 ℃. The relative atomic mass of cadmium is 112.41, the density is 8.65g/cm 3, the melting point is 320.9 ℃, and the boiling point is 767 ℃. Cadmium exists as a divalent metal in compounds. Cadmium exists as a divalent metal in compounds. Its hardness is 200hv. Its hardness is 200hv. Cadmium is similar to zinc in chemical properties, but it is insoluble in alkaline solution, soluble in nitric acid and ammonium nitrate, and slowly soluble in dilute sulfuric acid and hydrochloric acid. Cadmium is similar to zinc in chemical properties, but it is insoluble in alkaline solution, soluble in nitric acid and ammonium nitrate, and slowly soluble in dilute sulfuric acid and hydrochloric acid. In room temperature and dry air, there is almost no chemical change, but cadmium is easy to oxidize in humid air, and the formed oxide film can protect the metal cadmium from further corrosion. In room temperature and dry air, there is almost no chemical change, but in humid air, cadmium is easy to oxidize, and the formed oxide film can protect the metal cadmium from further corrosion.<br>Cadmium vapor and soluble cadmium salt are toxic, so cadmium pollution must be strictly prevented. Cadmium vapor and soluble cadmium salt are toxic, so cadmium pollution must be strictly prevented. The standard potential of cadmium is - 0.4V. The standard potential of cadmium is - 0.4V. In general industrial atmospheric environment, cadmium coating belongs to cathode coating for steel parts, but in marine climate, sea water or high temperature environment, cadmium coating belongs to anode coating for steel parts. In general industrial atmospheric environment, cadmium coating belongs to cathode coating for steel parts, but in marine climate, sea water or high temperature environment, cadmium coating belongs to anode coating for steel parts. When the working temperature is over 232 ℃, the cadmium coating is easy to cause the parts to be brittle. When the working temperature is over 232 ℃, the cadmium coating is easy to cause the parts to be brittle.<br>
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