Currently circulating water is mainly used inhibitor class of organic phosphonates, polymers, poly carboxylic acid salt compound formed. Organic phosphonates are mainly used resistive carbonate scale, poly carboxylic acids and their derivatives mainly used for blocking sulfate scale. Organic phosphonic acid corrosion inhibitor complex structure due to low stability and phosphorus content, reducing the risk of formation of calcium phosphate, but also reduce the environmental pressure eutrophication, can generate three-dimensional with calcium, magnesium, iron and other metal ions bicyclic or polycyclic structure chelates, metal salts deposited water has good inhibition, but also can inhibit the corrosion of metals in the system. Many polymers class because solubilization and lattice distortion presence of metal salts in water sediments better inhibition, while the non-crystalline sticky mud, dust and corrosion products such as iron oxide etc. from the dispersion, so that with the water flow, to avoid the deposition of dirt caused by corrosion under the scale. Copolymers of polyfunctional calcium carbonate, calcium sulfate, calcium scale is valid, the water dispersion of clay, iron oxide and other aluminosilicate has a strong suspension. This series of products with a low amount of high efficiency, high cost performance. Corrosion inhibitor ZH371SGR this product from organic phosphonates, phosphine acid, sulfonate copolymers and additives such as azole compound formed is add water according to the northern region of high hard, high alkali, high PH value water quality characteristics, a number of laboratory and field applications repeatedly demonstrated improvements made, there is a full and efficient corrosion inhibitor models. In open recirculating water systems using carbon steel, stainless steel, copper and other metal alloys have good corrosion resistance; particular scale deposition on a variety of circulating cooling water system has a strong inhibitory effect. Corrosion inhibitor ZH372SGR this product from the organic phosphonates, phosphate lipids, polycarboxylate compound formed, there is a full and efficient corrosion inhibitor models. According to groundwater or river water quality characteristics supplemented by "solubilized", "lattice distortion", "electrostatic repulsion" and other methods to control fouling salt water, the agents can be added to the system quickly cast in metal equipment solid surface to form a dense protective film can well meet the corrosion, scale required circulating water system. Low hardness (open systems) corrosion inhibitor ZH373SGR this product from the organic phosphonates, carboxylic acid copolymer, zinc salts, azoles, such as molybdate compound is made applicable to low hardness, low alkalinity water as a supplementary source of water, the low hardness open-loop water system. Dosing with low concentrations of suspended solids dispersion performance, carbon steel, copper, stainless steel and other metal materials corrosion rate and other characteristics, and can effectively prevent the formation of calcium carbonate and calcium phosphate. Cryogenic system corrosion inhibitor ZH374SGR this product circulating water system for the presence of low-temperature cryogenic easy scaling problems, adopt a low-phosphorus organic, biodegradable polylactic acid-based compound class of agents. Features of the complex formula is multifunctional role with corrosion, scale, decentralized; under conditions of high hardness and alkalinity, calcium carbonate, calcium phosphate, calcium sulfate and iron hydroxide and other sediments have good suppression and dispersion; same time is more important to solve the problem of low water temperature, low temperature deposition of scale exist in the circulating cooling water for a long time.