Failure analysis of coated galvanized steel panels
| Autor: | H. Saricimen, Luai M. Alhems, Anwar Ul-Hamid, Abdul Quddus |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Scanning electron microscope General Chemical Engineering Delamination Metallurgy Humidity 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Galvanization symbols.namesake Coating 0103 physical sciences Microscopy engineering symbols General Materials Science Composite material 0210 nano-technology Layer (electronics) Water vapor |
| Zdroj: | Anti-Corrosion Methods and Materials. 64:424-431 |
| ISSN: | 0003-5599 |
| DOI: | 10.1108/acmm-05-2016-1669 |
| Popis: | Purpose The purpose of this paper was to determine the mode and cause of failure of polyester-coated galvanized corrugated steel sheets that exhibited degradation of the coating after seven months into service. Design/methodology/approach Visual inspection and light microscopy revealed the extent of damage exhibited by the panels. Standard metallographic techniques were used to prepare samples obtained from both unused and failed sections. Light microscopy, scanning electron microscopy combined with energy dispersive x-ray spectroscopy and x-ray diffraction techniques were used to study the surface morphology, microstructural features, elemental composition and structure of the samples. Findings The failure occurred in the form of delamination and blistering of coated layer. Presence of solar radiation, humidity and water retention resulted in loss of adhesion, leading to coating delamination and flaking especially at the top surface. The coating at the bottom surface of the panels showed evidence of blistering caused by water vapor differential that existed between the environment and the coating because of prolonged (four months) wet conditions that existed at the manufacturer’s site during storage. Practical implications It is recommended that the coated panels are stored in covered area where direct exposure to atmospheric conditions can be prevented. If open storage is unavoidable, then the use of tarpaulin or plastic sheet as covering and vapor-phase inhibitors was recommended. Originality/value This paper provides an account of failure analysis of metal sheet panels. It identifies the mode and cause of failure and also provides recommendations to avoid such occurrences in the future. The information contained in this paper is useful for plant engineers and project managers working in the metal sheet industry. |
| Databáze: | OpenAIRE |
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