Use of Accelerated Tests to Estimate Corrosion Rates of Roofing Sheets

Authors

  • Juspher O. Ooko Department of Chemistry, University of Nairobi, P.O Box 30197-00100, Nairobi, Kenya
  • John O. Onyatta Department of Chemistry, University of Nairobi, P.O Box 30197-00100, Nairobi, Kenya
  • Amir O. Yusuf Department of Chemistry, University of Nairobi, P.O Box 30197-00100, Nairobi, Kenya
  • Peterson M. Guto Department of Chemistry, University of Nairobi, P.O Box 30197-00100, Nairobi, Kenya

Keywords:

Accelerated test, corrosion rate, salt spray, ultraviolet light.

Abstract

Roofing materials are important assets of our society however no material lasts forever. Atmospheric corrosion phenomenon leads to deterioration of materials. The objective of this study was to estimate the corrosion rate of metallic coated or pre-painted roofing sheets using accelerated testing method as compared to natural exposure. Accelerated tests were performed in ultraviolet light followed by salt spray at concentrations of 0.07% NaCl and 0.28% (NH4)2SO4 while in natural exposure the sheets were placed on racks under cyclic conditions of corrosive environment. The gloss and fade variations of pre-painted sheets were determined using spectroguide. Variations occurred within 10.5 days for accelerated tests and 90 days for natural conditions. Correlation analysis on gloss and fade variations under accelerated and natural conditions showed that for gloss R2 = 0.994 while fade R2 =0.831. Mass loss for galvanized and galvaluminized materials was determined using Shimadzu XRD-7000. Mass loss occurred within 10.5 days for the accelerated tests and 90 days under the natural conditions. High correlation indicates that accelerated tests can be used to estimate corrosion rates of roofing sheets under different corrosive environments.

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Published

2018-02-27

How to Cite

O. Ooko, J., O. Onyatta, J., O. Yusuf, A., & M. Guto, P. (2018). Use of Accelerated Tests to Estimate Corrosion Rates of Roofing Sheets. International Journal of Sciences: Basic and Applied Research (IJSBAR), 37(3), 1–8. Retrieved from https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/8699

Issue

Vol. 37 No. 3 (2018)

Section

Articles

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