Packaging steel strip electrolytic cleaning principle is what?

Packaging steel strip electrolytic cleaning principle is what? When connect the cathode and anode steel strip by electrolytic cell, steel strip as electrolytic cell of the positive or negative. In electrolysis process, the steel strip surface will be a small hydrogen or oxygen generation, these tiny bubbles have promote the dirt cleaned from the stripped from the surface of a steel band. In electrolytic degreasing sodium hydroxide, sodium carbonate is used in alkaline aqueous solution, such as the existence of alkali electrolyte ion, increased the water conductive ability, also played a promoting role to eliminate the dirt. Because lye to lipid oily dirt strong dispersion effect. But such as sodium hydroxide alkaline substances such as mineral oil with people about dirt dispersion ability is weak, so want to add people to the solution of sodium metasilicate and a small amount of surfactant, and mineral oil dirt dispersion. When caitu substrate is zinc or aluminium plate, due to the alkali resistance is poor, weak base such as sodium silicate as electrolyte, sodium metasilicate alkali corrosion resistance of nonferrous metals has obvious improvement action. When aluminum anodized relief wax ( That need to be metal degreasing aluminum electrolytic cell with the power connected to the anode, in the process of electrolytic aluminum as anode in aluminum anode golden field surface will precipitate anhydrous silica gel covering membrane, protect the aluminum corrosion is shout. When the foaming properties of surfactants are excessive to skim obstruction, to use low foaming surfactant or day to feed the surfactant dosage. Electrolytic degreasing method according to be skimmed substrate as electrode is divided into anode and cathode degreasing degreasing. The degreasing substrates are connected to the power supply cathode called cathode skim. Due to the electrolytic process, the hydrogen gas is generated in a cathode anode produce oxygen twice, so the cathode produce hydrogen for the dirt on the surface of the substrate stripping effect is better. But if the deal with excessive, in cleaning object namely steel strip surface can form the powdery material, to be pickled post-processing to remove these materials at this time. Another when steel cathode electrode skim also produces hydrogen can cause the nature of the brittle, and absorbed the phenomenon known as the hydrogen embrittlement. Hydrogen embrittlement in all kinds of high, low carbon steel and metal zinc is the most obvious. And brittleness is proportional to the amount of hydrogen absorption. So steel substrate usually use anode more without the cathode electrolytic degreasing degreasing.