Severe corrosion and cracking problems in Amine units and associated plants have been documented extensively. Mitigating these issues has had a significant economic impact in the oil and gas refining industries where this equipment is used to capture acid gases, such as CO2 and H2S. Currently, expensive austenitic stainless steels and other corrosion resistant alloys are being utilised to control these corrosion issues with varying degrees of success.

In this paper, the use of advanced cold applied liquid coatings, as an alternative solution to expensive alloys, are examined. In particular, the performance of a specific coating is considered (under a rigorous testing regime) in environments containing the amines MDEA and DGA with combinations of sour gases. The permeation properties of the coating were also examined by conducting a six month cold wall test using demineralised water at 150°C. It is found that this coating offers excellent resistance even when the testing environment respectively contains 38.8% H2S at a temperature and pressure of 150°C and 1000psi. Finally, some case studies are discussed which provide verification to the experimental results obtained.

Subject
Test methods, Electrochemical impedance spectroscopy, Barriers, Coating inspection, Water, Coatings, Autoclaves, Acid gases, Pull off adhesion test, Amines, Dry film thickness, Corrosion protection, Barrier coatings
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2019
Association for Materials Protection and Performance (AMPP)
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