Effect of burnishing on HVOF coated boiler steel against hot corrosion in actual boiler environment

IF 2.4 4区材料科学 Q3 MATERIALS SCIENCE, COATINGS & FILMS Surface Engineering Pub Date : 2023-05-04 DOI:10.1080/02670844.2023.2242117

A. Agnihotri, S. Kalsi, H. Kansal

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Abstract

ABSTRACT Hot corrosion of boiler tubes used in steam-generating systems has been recognized as a severe problem, resulting in tube wall thinning and premature failure. In this study, the effect of burnishing the thermal sprayed coatings against high-temperature corrosion of SA213-T22 boiler steel in actual environmental conditions of coal-fired boiler has been investigated. An experimental study was carried out for ten cycles, where the individual cycle consists of one-hundred hours of exposure trailed by one hour of ambient cooling. The hot corroded specimens are visually inspected at the end of each cycle to check for any variation in colour, luster, spalling tendency, and other physical changes in scale. The tested specimens were characterized through Thermogravimetric Technique, Microhardness Tester, Optical Microscope, Scanning Electron Microscope, and X-Ray Diffractometer to study their hot corrosion performance. The findings of this work suggest that burnishing can be potentially used for providing superior hot corrosion protection to any of the thermal sprayed coated specimens.

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实际锅炉环境中抛光对HVOF涂层锅炉钢热腐蚀的影响

蒸汽发生系统中使用的锅炉管的热腐蚀已被认为是一个严重的问题，导致管壁变薄和过早失效。本研究在燃煤锅炉的实际环境条件下，研究了SA213-T22锅炉钢热喷涂涂层的高温腐蚀抛光效果。进行了一项为期十个周期的实验研究，其中单个周期由100小时的暴露和一小时的环境冷却组成。在每个循环结束时，对热腐蚀试样进行目视检查，以检查颜色、光泽、剥落趋势和其他物理尺度变化。采用热重法、显微硬度计、光学显微镜、扫描电镜和X射线衍射仪对试样进行了表征，研究了试样的热腐蚀性能。这项工作的发现表明，抛光可能用于为任何热喷涂涂层试样提供卓越的热腐蚀保护。

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来源期刊

Surface Engineering 工程技术-材料科学：膜

CiteScore

5.60

自引率

14.30%

发文量

审稿时长

2.3 months

期刊介绍： Surface Engineering provides a forum for the publication of refereed material on both the theory and practice of this important enabling technology, embracing science, technology and engineering. Coverage includes design, surface modification technologies and process control, and the characterisation and properties of the final system or component, including quality control and non-destructive examination.