The mechanism and purpose of the scale and corrosion inhibitor is to form a metal film on the metal surface in isolated contact with water. Films were classified by type:

precipitated films, such as polyphosphate (sodium hexametaphosphate, sodium tripolyphosphate), phosphate, organic phosphonate (ATMP aminotrimethylene phosphonic acid, EDTMP ethylenediamine tetramethylene phosphonic acid, HEDP hydroxyethylidene diphosphonic acid), phosphonic acid (pbtca-2-carboxylic acid, 2,4-butane), phosphate (hydroxyethyl phosphonate). They are all corrosive, scale effect. Zinc; Silicate. Oxide film type: such as chromate, molybdate, nitrite. Metal ion precipitation film: such as benzotriazole (BTA), methylbenzotriazole (TTA), which is a good corrosion inhibitor for copper and copper alloys

in polyphosphate, the scale inhibitor mechanism is electrodeposited thin film. Polyphosphate is a negatively charged ion in water, which produces positively charged complex "na2calcium p6o6" ions and calcium ions in water. When deposited on the metal surface depending on the current generation of metal corrosion, it cuts off the contact between the oxygen and the metal, thereby preventing corrosion. Therefore, there is a certain concentration of calcium ions in the water required by multiple regions based on phosphorus. Organic forests are affected by the same principles

zinc hydroxide precipitates in the cathode, and the cathode reaction prevents corrosion and prevents the sky. The zinc deposition rate is appropriate, but the film is not strong and loose. Generally not used alone. With its suitable speed and film characteristics, together with other corrosion inhibitors, such as zinc phosphate, the precipitates adhere to the metal surface tightly, which is more excellent and compact

several scale inhibitors are usually mixed in a certain proportion, and the better if they are less than one, which is called "synergy"

2, there are two kinds of commonly used scale inhibitor dispersants

scale inhibitor dispersants

phosphonic acid groups that sell well, such as organic phosphonate, are commonly used: ATMP, EDTMP, HEDP, dtpmp, pepamp (macromolecular phosphonate), hydroxyethyl phosphate, phosphonic acid PBTCA (phosphobutane-1,2,4-tricarboxylic acid), 2-hydroxy-phosphonic acid (HPAA)

their calcium carbonate and zinc scales have good scale inhibition ability, and also have certain corrosion inhibition effect, and have good synergistic effect with other polymers and zinc salts. In particular, the latter three have high calcium ion tolerance and are suitable for use at good concentrations

excellent polycarboxylic acid water-soluble polymers, mainly acrylic homopolymers and copolymers, and maleic acid homopolymers and copolymers

polyacrylic acid (PAA) is commonly used; Acrylic acid acrylate copolymer (AA / HPA); Maleic acid acrylic acid (ester) copolymer (MPMA / AA); Acrylic acid acrylic acid copolymer (AA / SA). In particular, amps containing polymers (acrylamide-2-methylpropane sulfonic acid), such as AA / AMPS / EMA, have excellent comprehensive properties and are terpolymers of calcium phosphate, iron oxide and zinc hydroxide. Therefore, sand can disperse and stabilize phosphorus and zinc to expand the influence of pH value. Used to prevent the deposition of calcium phosphate