Corrosion inhibitors and scale inhibitors can be tailored chemicals that are added in low concentrations to water, which would normally cause scale deposits. Preventing limescale buildup in washing machines is one example.
Scale inhibitors or antiscalants can be organic compounds containing sulphonate and/or carboxylic acid functional bands and chelating agent carbon, aluminum, and zeolites. These compounds sequester and neutralize any ions that may form.
How can scale inhibition possibly be achieved? You can add substances that react chemically with scale-forming substances so that the thermodynamically stable region is reached. Or you can suppress crystal growth. Scale inhibitors can be used for longer periods to prevent the formation of scale on surface and equipment treatments.
What types of corrosion inhibitors are there?
A corrosion inhibitor refers to a chemical compound that is added to liquids or gases. This reduces the rate of corrosion in a material (usually a metal alloy or metal) that comes into contact with the liquid. The chemicals react to the metal surface or environmental gases and cause erosion. They also interrupt the chemical reaction which causes corrosion. The fluid composition, the amount of water, and the flow regime are key factors in determining how effective a corrosion inhibitor is. Inhibitors can be applied to the metal’s surface by absorbing water and forming protective films.
You can choose from:
- Cathodic inhibitors – act as sacrificial and protective anodes by protecting the cathode.
- Mixed inhibitors can provide corrosion protection in both the anodic and cathodic senses.
- Volatile Corrosion Inhibitors – These are mostly made of amino acids or nitrile substances. They form a thin barrier on packaging surfaces to protect metal surfaces and prevent rust and corrosion.
What types of scale inhibitors are there?
There are two types of scale inhibitors: organic and inorganic. Condensed Phosphates such as poly(metaphosphates or phosphate sals are some examples of the inorganic type. High temperatures are where phosphonates work best, while low-temperature sulfonated compounds are more effective.
Three major groups can be divided into scale inhibitors:
- Thermodynamic inhibitors – complexing agents and chelating substances, which are appropriate for specific scales.
- Akinetic inhibitors, which are used to stop scale deposition, may also be useful.
- Surface active chemicals – Adherence inhibitors simply inhibit crystal adhesion to metal surfaces.
Adsorption effects and morphological differences of the growing sites are two ways the kinetic scale inhibitor works. Adsorption effects make it possible for the inhibitor molecules in the nucleation areas that are most preferred by the scale-forming molecules to reside. Crystals cannot adhere to the surface so they are not encouraged to crystal nucleation. Conventional scale inhibitors can dissolve in water. The scale inhibiter should be absorbed onto the rock. This will prevent the chemical from being washed away. Adsorption on the rocks can change the system’s surface and wettability. These problems can be overcome with oil-soluble scale inhibitors.
Do you have selection criteria for scale inhibitors or corrosion?
- Application technique is the most critical if the inhibitor must be squeezed into formation.
- Fewer products are effective at scaling high rates.
- Efficiency Scale control at low inhibitor concentrations
- High thermal resistance – higher temperatures and more life are required to limit the types of chemistry that can be used.
- Environmental considerations — Low toxicity and high biological degradation
- PH – Scale inhibitors that are used in conventional settings perform poorly in low-pH conditions.
- Viscosity- This is vital when considering long umbilical applications such as those that are located in remote subsea lands.
- Pricing: Sometimes the cheapest products are the most cost-effective, while other times the more expensive products have the best results.
What’s the advantage of scale inhibitors or corrosion?
- Many closed recirculation systems provide corrosion inhibition
- Electrolytic corrosion can be prevented
- Protect against erosion and cavitation
- Protect metal surfaces
- It’s cost-effective and easy to apply and use
- Offer improved performance
- Help reduce maintenance and cleaning costs
- Improve reliability
- Optimize your operational efficiency