Scale Preventive & Corrosion Inhibitor

Scale preventive and corrosion inhibitors are chemical additives used in water treatment to mitigate the formation of scale and prevent corrosion in various industrial systems. Here’s an overview of these additives and their functions:

Scale refers to the deposition of minerals, such as calcium carbonate, calcium sulfate, and others, on surfaces in contact with water. Scale formation can be detrimental to equipment efficiency, leading to reduced heat transfer, blockages, and increased energy consumption. Scale preventive additives work by inhibiting the crystallization and precipitation of these minerals, thereby preventing scale formation. Some common scale preventive additives include:


Scale preventive additives are designed to inhibit the formation of scale by interfering with the crystallization process or modifying the properties of scale-forming minerals. These additives can work by sequestering or chelating the scale-forming ions, preventing them from precipitating and forming scale. They may also act as dispersants, altering the crystal structure and inhibiting the growth and adhesion of scale-forming minerals.


Phosphonates, such as HEDP (1-hydroxyethylidene-1,1-diphosphonic acid) and ATMP (aminotris(methylene phosphonic acid)), are effective scale inhibitors widely used in water treatment. They can sequester calcium and magnesium ions, preventing them from forming scale.

Polymeric Scale Inhibitors:

These are high-molecular-weight polymers that can prevent scale formation by interfering with crystal growth and inhibiting the adhesion of scale-forming minerals to surfaces.

Chelating Agents:

Chelating agents, like EDTA (ethylenediaminetetraacetic acid) and NTA (nitrilotriacetic acid), can form complexes with metal ions, reducing their ability to form scale.

Corrosion is the deterioration of metal surfaces caused by chemical or electrochemical reactions with the surrounding environment. In industrial systems, corrosion can lead to equipment failure, leaks, reduced efficiency, and safety hazards.

Corrosion inhibitors are chemicals that protect metal surfaces from corrosive attack by creating a protective barrier or altering the electrochemical reactions that lead to corrosion. They work by adsorbing onto the metal surface, forming a passivating layer that inhibits the corrosion process. Common corrosion inhibitors include:


Corrosion inhibitors are chemical compounds that are added to water or other process fluids to protect metal surfaces from corrosion. They work by forming a protective barrier on the metal surface or altering the electrochemical reactions that lead to corrosion. Corrosion inhibitors can adsorb onto the metal surface, forming a thin film that acts as a barrier against corrosive agents. They can also modify the chemical environment, shifting the electrochemical reactions towards less corrosive pathways.

Inorganic Inhibitors:

Inorganic corrosion inhibitors, such as zinc phosphate, sodium nitrite, and sodium molybdate, provide a protective film on metal surfaces, preventing corrosion.

Organic Inhibitors:

Organic corrosion inhibitors, like amines, imidazolines, and filming amines, create a protective barrier on the metal surface, inhibiting corrosion.

Volatile Corrosion Inhibitors (VCIs):

VCIs release vapors that form a thin protective layer on metal surfaces. They are often used in closed systems or for protecting equipment during storage or transportation.