Well-established treatment concepts for corrosion control.
In petrochemical processes corrosion often occurs in various forms and causes serious damages to the equipment. For economic reasons it is not possible to replace carbon steel materials completely with corrosion resistant alloys (CRA´s). Corrosive species are oxygen, oxygenates, carbon dioxide (CO2), hydrogen sulfide (H2S), phenols and organic acids (i.e. formic, acetic and propionic acid). Corrosion is an electrochemical process which can be prevented or significantly reduced by suitable corrosion inhibitors.
A distinction is made between:
- Uniform corrosion
- Crevice corrosion
- Hydrogen Induced Corrosion (HIC)
- Stress Corrosion Cracking (SCC)
- Amalgam corrosion (AHXs / Liquid metal embrittlement)
Kurita provides very powerful treatment programs for corrosion protection, which comply with the specific requirements of the relevant production plants. Our well-established chemical treatment concepts for corrosion control include basically oxygen scavengers, alkalising amines, film forming amines (FFA´s) or combinations of them.
Corrosion by oxygen in the boiler or dilution steam generator system (DSG) can be controlled by the addition of an oxygen scavenger. Hydrazine is no longer allowed to be used because of its toxicity and the suspicion of being carcinogenic. Kurita´s very effective oxygen scavenger programs are easy to handle and above all not carcinogenic in order to protect and maintain the health of the employees.
Kurita´s alkalising amines are neutralising amines which operate by reacting with any acid constituent in a straight forward chemical neutralisation and shift the pH to a higher level. Our “ready-to use formulations” provide the right combination of high-boiling and low-boiling amines to ensure an inhibition of steam and water phase.
Our inhibitor programs with filming amines can help to stop or decelerate the corrosion. They will provide perfect protection by forming a very thin film, which acts as a barrier against corrosive substances. If filming amines are selected, oxygen scavengers, phosphates and caustic dispersants are no longer required. The filming amines can be used in combination with alkalising amines.
We apply sodium-free products to avoid sodium-induced stress corrosion cracking and the formation of coke in the cracker. Dangerous amalgam corrosion in the raw gas flow is inhibited by the use of our special mercury scavengers.
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