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Corrosion – Degradation of metals due to electrochemical process. Corrosion is the deterioration and loss of a material and its critical properties due to chemical, electrochemical and other reactions of the exposed material surface with the surrounding environment.

How to Prevent Corrosion:

You can prevent corrosion by selecting the right:

Metal Type

Protective Coating

Environmental Measures

Sacrificial Coatings

Corrosion Inhibitors

Design Modification

 Corrosion Inhibitors:

Reduce corrosion rate when added in small quantity. These are additives added to the upstream where they create a thin film of protection against rust-inducing agents

Types of inhibitor: –

Anodic: inhibits corrosion of anode

• Some inorganic salts like metal silicate & borates

Cathodic: inhibits corrosion of cathode

• Some reducing agents like sodium thio sulphate & some salts of Ni, Mg etc/.

Corrosion Protection:-

A process of preventing corrosion on any surface can be termed as Corrosion Protection

It could be permanent protection such as Alloy steel, electroplating etc. or it could be temporary protection such as coatings etc. which provide temporary protection from 3 hours to more than 3 years depending upon the type of corrosion protection product used.

Corrosion Protection techniques:-

·       Tin plating

·       Galvanization

·       Coating

·       Enameling

High-pressure Water Jetting : It is also known as hydro-jetting which includes the process of cleaning and unblocking the drains comes under the surface preparation.

As the name implies, this technique involves the use of high-pressure water in order to clean remove the toughest of blockages

Water jetting methods are similar to wet abrasive blasting cleaning with Flash rust evidenced in the prepared surface. The main advantage of water jetting is to remove all contamination that includes chemical products (i.e. Salts). The best effective method for salt removal from the surface.

Advantages

It will restore existing surface profile (it will not damage the existing profile in maintenance project)

It will remove entire contamination

Very effective process

Disadvantages

It will not create a surface profile

Equipment cost is very high

High operator skill is mandatory

Highly dangerous due to high pressure involved

Type of Water jetting

Low-pressure water cleaning (LPWC) – below 5000 psi

High-pressure water cleaning (HPWC) – 5000 – 10000 psi

High-pressure water jetting (HPWJ) – 10000 – 30000 psi

Ultra-high pressure water jetting (UHPWJ) – more than 30000 psi

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