FAILURE ANALYSIS OF ALUMINIUM AND ZINC HEAT REFLECTOR IN TIMBER DRYKILN

Sulistioso Giat S.; A Sitompul; M. N. Indro; A Rahmatika

doi:10.17146/jsmi.2012.14.1.4642

FAILURE ANALYSIS OF ALUMINIUM AND ZINC HEAT REFLECTOR IN TIMBER DRYKILN

Sulistioso Giat S.⁽¹⁾, A Sitompul⁽²⁾, M. N. Indro⁽³⁾, A Rahmatika⁽⁴⁾,

(1) Center For Technology of Nuclear Industry Materials (PTBIN)-BATAN Kawasan Puspiptek Serpong 15314, Tangerang, Indonesia
(2) Center For Technology of Nuclear Industry Materials (PTBIN)-BATAN Kawasan Puspiptek Serpong 15314, Tangerang, Indonesia
(3) Department of Physics, IPB Jl. Meranti, Darmaga, Bogor 16680, Indonesia
(4) Department of Physics, IPB Jl. Meranti, Darmaga, Bogor 16680, Indonesia

Corresponding Author

Abstract

FAILURE ANALYSIS OF ALUMINIUM AND ZINC HEAT REFLECTOR IN TIMBER DRYKILN. Aluminium and Zinc (Al-Zn) alloy coated steel sheet (JIS G3141) was used as a heat reflector in timber dry kiln. After six months continuous service at 110°C in moist condition, the heat reflector is corroded. Failure analysis method was used to analyze this corrosion phenomena. Macroscopic and microscopic examination with some characterization have been performed to determine the elemental composition and corrosion products. The elemental composition of corroded heat reflector that were detected by SEM-EDS are sulphur, chloride, calcium, and potassium. XRD analysis revealed the zinc aluminium carbonate hydroxide hydrate (Zn₆Al₂(OH)16CO₃.4H₂O) known as black rust staining and iron oxide (Fe₃O₄), as corrosion products. Environmental condition in timber dry kiln with the existence of acid and alkaline elements cause the corrosion process occur. Those elements come fromthe dried timber and steam that adhered on the heat reflector surface attacked the Al-Zn coating and base metal. Humidity and high temperature in timber dry kiln environment increase the corrosion rate of the heat reflector.