Research on the film‐forming characteristics of octadecylamine at high temperatures

Shun'an Cao (College of Power and Mechanical Engineering, Wuhan University, Wuhan, China)
Jiayuan Hu (College of Power and Mechanical Engineering, Wuhan University, Wuhan, China)
Jianli Xie (College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, China)
Qinqin Liang (College of Power and Mechanical Engineering, Wuhan University, Wuhan, China)
Li Yin (College of Power and Mechanical Engineering, Wuhan University, Wuhan, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Publication date: 4 January 2013

Abstract

Purpose

The purpose of this paper is to set out a study of the film‐forming characteristics of octadecylamine (ODA), estimate the feasibility of shutdown protection using ODA at high temperatures, and determine the optimum process condition of shutdown protection for units under full load if ODA has a good film‐forming effect at high temperatures.

Design/methodology/approach

An autoclave was used to simulate the water‐vapor environments at 350‐560°C in the water‐steam system of power plants. The decomposition test of ODA was investigated and the ODA film‐forming characteristics were studied for furnace tube materials used in gas‐fired power plants.

Findings

Results showed that ODA had a decomposition equilibrium and the decomposition products did not contain harmful organic substances such as low molecular organic acids. ODA would form a satisfactory protective film in the range of 350‐560°C with the best film at 480°C. The protection effect of the film formed by ODA at 560°C was much stronger than was that of its oxide film, which showed the feasibility of shutdown protection using ODA for gas‐fired power plants operating under full load. The optimal conditions of shutdown protection under full load were as follows: the temperature was 560°C, the concentration of ODA was 80 mg/L, the pH was 9.5 and the exposure time was 2 h. From the experimental results of X‐ray photoelectron spectroscopy, it was known that the surface film on the specimens was composed of a compound of ferroferric oxide and ODA, and the film‐forming mechanism was chemical adsorption between N in the ODA and Fe.

Originality/value

It was found that ODA has a good film‐forming effect at high temperatures and it is practicable to implement shutdown protection for base‐load units. The research results can provide theoretical guidelines for shutdown protection of gas‐fired power plants.

Keywords

Citation

Cao, S., Hu, J., Xie, J., Liang, Q. and Yin, L. (2013), "Research on the film‐forming characteristics of octadecylamine at high temperatures", Anti-Corrosion Methods and Materials, Vol. 60 No. 1, pp. 14-19. https://doi.org/10.1108/00035591311287401

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Publisher

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Emerald Group Publishing Limited

Copyright © 2013, Emerald Group Publishing Limited

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