Drug skin contains large amounts of alkaline slag material (marble, fluorite, etc.), and contains a certain amount of deoxidizer and alloying agent. AlkalineWelding Electrodedepends mainly on the carbonate decomposition of CO2 for shielding gas (such as CaCO3), the arc column, an atmosphere of hydrogen partial pressure lower, and calcium fluoride in fluorite at high temperatures and hydrogen combine to form hydrogen fluoride (HF), reduce the amount of hydrogen in the weld, so the alkaline electrode is also known as a low hydrogen type electrode. Measured by glycerol per 100g diffusible hydrogen content in the deposited metal, alkaline electrode 8mL, acid electrode 17 ~ 50mL. CaO in the number of basic slag, slag desulfurization capacity, and the deposited metal thermal crack ability. Moreover, the alkaline electrode due to the low content of oxygen and hydrogen in the weld metal, non-metallic inclusions less, with high ductility and impact toughness. Alkaline electrode due to the drug skin contain more fluorite, arc stability, the general use of the DCRP, only when the drug skin contains higher amounts of stable arc agent, AC and DC dual-use. AlkalineAluminium Welding Rod are generally used for welded structures, such as to withstand the dynamic load or rigid structure. Universal electrode
The existing air electrode can be summarized as follows: ① air electrode polarization is serious: the high current oxygen diffusion difficulties caused by the oxygen electrode polarization. The difficulty of oxygen diffusion depends on the porosity of the gas diffusion layer, hole long and tortuous, that is, depends on the ratio of the gas diffusion layer materials and molding conditions. In order to reduce the polarization of the air Nickel Welding Electrodes, and the need to further optimize the structure of the air electrode to improve the speed of the gas phase mass transfer of oxygen. ② catalyst instability, and can not meet the requirements of large current discharge, and required preparation of an efficient and practical catalyst. In recent years, the organic acid catalysts, metal oxide catalysts (such as Titania and MnC2, PbO2 by), etc. by the people's attention, its source is abundant, inexpensive, and greatly reduces the cost, but the catalytic activity is not high, the battery current is too low, and therefore seek high catalytic activity and low-cost, pollution-free catalyst is the key to the impact of the air electrode practical. (3) air electrode "sweating", take the salt "is serious. Exudate of the air electrode air battery development, and more with the presence and production process of the waterproof electrode carbon. This problem has seriously affected the performance of air electrode, and makes the life of the air Tungsten Electrode is generally short. This article only describes several oxygen reduction catalyst profiles.