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Thermal Spray Coating for Corrosion Under Insulation Prevention

Mohd Fazril Irfan bin Ahmad Fuad, Mohd Fazril Irfan (2009) Thermal Spray Coating for Corrosion Under Insulation Prevention. Universiti Teknologi Petronas, Sri Iskandar,Tronoh,Perak. (Unpublished)

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Abstract

orrosion under Insulation (CUI) is one of the predominant mechanical integrity issues affecting the industry. CUI refers to external corrosion, but it is difficult to detect because of the insulation cover that masks the corrosion problem. One of the options to prevent corrosion under insulation is by protective coating systems. Thermal spray coating (TSC) is an advanced coating system and shows promising performance in harsh environment and could be used for preventing CUI. However, the application of TSC is not attractive due to high initial cost. The project focused on evaluation of TSC based on corrosion performance using linear polarization method, salt spray test and evaluation of coating mechanical performance using adhesion test, bend test and microstructure characterization of the coating. For the salt spray test, there was no sign of corrosion products especially at the center (fully coated region). TSC protected the steel satisfactorily, whether by barrier effect and by cathodic protection. Under Scanning Electron Microscope (SEM) TSC did not show any corrosion defects after 336 hours of continuous exposure to salt fog test which means the coating is a perfect barrier from corrosive environment. The LPR test results showed that the TSC yields low corrosion rate of 0.05mm/year compared to the bare steel especially at high temperature 80 oC where usually normal coating fails. In conclusion, TSC was evaluated technically acceptable for long term protection of corrosion under insulation. Further research should be done on corrosion performance and life cycle cost by comparing the TSC with conventional coating.

Item Type: Final Year Project
Subject: T Technology > TJ Mechanical engineering and machinery
Divisions: Engineering > Mechanical
Depositing User: Users 5 not found.
Date Deposited: 11 Jan 2012 12:24
Last Modified: 25 Jan 2017 09:44
URI: http://utpedia.utp.edu.my/id/eprint/763

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