Corrosion inhibitor for circulating water system

Corrosion inhibitor for circulating water system

Corrosion inhibitor for circulating water systemIt is an important chemical agent used in industrial water treatment to prevent corrosion of metal equipment, widely used in circulating cooling water systems in power plants, petrochemicals, steel and other industries. The following will provide a detailed introduction from multiple aspectsCorrosion inhibitor for circulating water systemRelated knowledge.

Types and principles of corrosion inhibitors

Main types

1. ‌Organophosphorus scale and corrosion inhibitorsExamples include ATMP (Aminotrimethylphosphonic acid), HEDP (Hydroxyethylphosphonic acid), DTPMPA (Methylphosphonic acid), EDTMPS (Sodium ethylenediaminetetramethylphosphonate), and HPAA (Hydroxyphosphonoacetic acid)

2. ‌Polymer based corrosion inhibitorsExamples include phosphono carboxylic acid copolymers, green scale and corrosion inhibitors PESA (polyepoxysuccinic acid), PASP (polyaspartic acid), etc

3. ‌copper corrosion inhibitorSuch as benzotriazole (BTA), mercaptobenzothiazole (MBT), etc., specifically used for corrosion inhibition of copper and copper alloys

4. ‌Composite corrosion and scale inhibitorComposed of organic phosphonates, multi-component copolymers, and corrosion inhibitors, it has multiple functions of corrosion inhibition, scale inhibition, sterilization, and algae killing

Mechanism of action

1. ‌Chelation solubilization effectCorrosion inhibitor molecules can form soluble chelates with metal ions such as Ca ² ⁺ and Mg ² ⁺ in water, increasing the solubility of calcium and magnesium salts

2. ‌Film-forming protective effectForm a protective film on the metal surface to isolate corrosive media from contact with the metal

3. ‌Electrochemical inhibition effectChanging the electrochemical properties of metal surfaces to reduce corrosion rates

4. ‌分散作用Preventing sediment from adhering to metal surfaces through coagulation and dispersion

5. Instructions for use

6. ‌Calculation of dosage‌：

1. The recommended concentration for general addition is 5-20mg/L (based on the amount of supplementary water)

2. Formula: X=(P × M)/1000, where X is the dosage (kg/h), P is the target concentration (mg/L), and M is the amount of supplementary water (m ³/h)

7. ‌Dosing method‌：

8. Continuous dosing: Continuous dosing through a metering pump or automatic dosing device

   Intermittent dosing: suitable for small systems, dosing multiple times a day

   Dosing location: Usually evenly added in the collection tank or makeup water pipeline

9. ‌operating steps‌：

10. Check the cleanliness of the dispensing box

    Add corrosion inhibitor and dilution water according to the calculated amount

    Stir for 15-30 minutes to ensure dissolution

    Adjust the liquid level to the specified value

    Stop stirring after checking the system for leaks

Corrosion inhibitor for circulating water system

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