stevia

Our sea rich in water resources, using seawater as industrial water for the growing lack of freshwater conservation has important strategic significance. However, the corrosive effects of sea water due to strong metal to make the water in the industrial application is limited. Copper for its excellent strength, machinability, electrical conductivity and thermal conductivity, especially excellent corrosion resistance, making copper equipment, piping, etc. at the beginning instead of the steel used in more areas in the marine environment. Typically, the copper corrosion tendency is small, but high conductivity salt in the medium, the surface of the metal easy to form the micro and macro cells, the more severe the copper corrosion occurs. Thus copper corrosion and protection issues have received increasing attention, add a simple and effective way to solve this problem inhibitor in corrosive media. Many types of copper corrosion inhibitor, which is a kind of organic matter is very important and the most widely used inhibitor. Copper metal corrosion inhibitor compounds from the 1920s began using arsenic compounds as copper corrosion inhibitor research began in the 1930s, but in recent years more and more aspects of research shifted to organic corrosion inhibitors.
The early 1950s, Benzotriazole (BTA) has become one of the most effective and commonly used corrosion inhibitor of copper and its alloys.
BTA has superior anti-chlorine properties, N atom lone pair electrons in the molecule ligand bond connected with Cu, alternating with each other to form a chain-like polymer film. M.Statake study reported the molecular structure of the surface film formed on the copper BTA TOF spectra (Tofsims), BTA inhibition effect is due to the near neutral solution in the copper surface to form a Cu (I) -BTA polymer composite film. For Cl- of Cu corrosion, Hung Chuan using linear potential sweep and Tafel experiments further study BTA inhibition mechanism at high concentrations of copper chloride environment. When the BTA mass fraction greater than 0.112%, BTA cover layer has effectively masks the most active copper surface area, or cover layer thickness limit is reached, so that the corrosion potential Ecorr stabilized. Although BTA good inhibition effect, but there is a certain toxicity, higher prices, when use is restricted. Found, BTA derivatives have excellent copper corrosion performance, but the hydrogen-triazole ring is substituted with a methyl group, is not conducive to the stability of the molecule at the surface of the copper protective film is formed, the inhibition effect will be greatly reduced, and After the introduction of alkyl benzene ring in the inhibition effect can be enhanced. TTA, BTA molecular structure than one more non-polar group, a hydrophobic monomolecular layer which is formed a better film, and the presence of methyl groups on the reaction between the molecules and the Cu did not interfere. Therefore, the inhibition performance is better than TTA, BTA, its corrosion behavior is more durable, and better use of effects mixed with BTA. However, the amount of TTA problem there is a limit to study the corrosion inhibition TTA in 3% NaCl solution for copper Yang Mai's, who used light voltage method. The study found that there is a critical concentration phenomenon in the reaction, the TTA was added at less than the critical concentration, the formation of a dense film having no voids, the void region is susceptible to corrosion of the anode, a cathode to form large and small anode! type internal battery, causing localized corrosion of copper matrix; while above this critical concentration increases with the concentration of TTA, TTA protective film becomes more dense, the greater the thickness of the copper Cl- prevent erosion, corrosion inhibition and the more good.