In the first paper (Zheng et al., 2010), the hygrothermal performance of highly insulated flat compact zinc roofs was assessed. This article evaluates the zinc sheeting corrosion behavior of the roofs. After an exposure of 28 months, little corrosion occurred at the sheeting upside. However, serious pitting corrosion developed at the sheeting underside. The maximum pit depths measured in the samples (0.5 × 0.7 m2) collected from each roof were between 124 and 209 μm. The main corrosion products identified were Zn5(CO3) 2(OH)6 and ZnO. It was found that less condensation deposit at the sheeting underside did not guarantee a reduction in underside corrosion. The wetting/drying cycling at the sheeting underside played a very important role in the corrosion process. The results show that, in addition to the reduction of the sheeting underside TOW (time of wetness), the number of wetting/drying cycles should also be decreased.
Anderson EA ( 1995) The Atmospheric Corrosion of Rolled Zinc. ASTM STP175. West Conshohocken, Pennsylvania: American Society for Testing and Materials , 126-134.
2.
Araoka A., Sudo S. and Tsuru T. ( 1997) Corrosion depth measurement for bottom plate of fuel storage tanks and results of ultrasonic thickness inspection. Corrosion Engineering, 47: 155-162.
3.
Arenas MA and Damborenea J. ( 2005) Protection of Zn-Ti-Cu alloy by cerium trichloride as corrosion inhibitor. Surface & Coatings Technology, 200: 2085-2091.
4.
Aziz PM ( 1956) Application of the statistical theory of extreme values to the analysis of maximum pit depth data for aluminum. Corrosion , 12: 495-506.
5.
Bertling S., Odnevall Wallinder I., Leygraf C. and Kleja D. ( 2006) Occurrence and fate of corrosion-induced zinc in runoff water from external structures. Science of The Total Environment , 367: 908-923.
6.
Eldredge GG ( 1957) Analysis of corrosion pitting by extreme-value statistical and its application to oil well tubing caliper surveys. Corrosion , 13: 51-60.
7.
Galambos J. ( 1987) The Asymptotic Theory of Extreme Order Statistics. FloridaRobert E. Krieger Publishing Company.
8.
Gumbel EJ ( 1967) Statistics of Extremes. New York, USA: Columbia University Press.
9.
He W, Odnevall W and Leygraf C. ( 2001) A laboratory study of copper and zinc runoff during first flush and steady-state conditions. Corrosion Science, 43: 127-146.
10.
Johnson NL and Kotz S. ( 1970) Continuous Univariate Distributions-1. New York: Wiley-Interscience Publication, John Wiley & Sons.
11.
Jouen S., Hannoyer B., Barbier A., Kasperek J. and Jean M. ( 2004) A comparison of runoff rates between Cu, Ni, Sn and Zn in the first steps of exposition in a French industrial atmosphere. Materials Chemistry and Physics, 85: 73-80.
12.
Mansfeld F. and Tsai S. ( 1980) Laboratory studies of atmospheric corrosion - I. Weight loss and electrochemical measurements. Corrosion Science, 20: 853-872.
13.
Morales J., Diaz F., Herna Hernandez-Borges J., Gonzalez S. and Cano V. ( 2007) Atmospheric corrosion in subtropical areas: statistic study of the corrosion of zinc plates exposed to several atmospheres in the province of Santa Cruz de Tenerife (Canary Islands, Spain). Corrosion Science, 49: 526-541.
14.
Odnevall W., Verbiest P., He W. and Leygraf C. ( 2000) Effects of exposure direction and inclination on the runoff of zinc and copper roofs. Corrosion Science, 42: 1471-1487.
15.
Sereda PJ ( 1974) Weather Factors Affecting Corrosion of Metals, Corrosion in Natural Environment. ASTM, STP558, West Conshohocken, Pennsylvania: American Society for Testing and Materials, 7-12.
16.
Showak W. and Dunbar SR ( 1982) Effect of One Percent Copper Addition on Atmospheric Corrosion of Rolled Zinc after 20 Year’s Exposure, Atmospheric Corrosion of Metals . ASTM STP767, West Conshohocken, Pennsylvania: American Society for Testing and Materials, 135-162.
17.
Spence JW and Haynie FH ( 1976) Pitting of Galvanized Steel in Controlled Clean Air Environments, Galvanic and Pitting Corrosion-Field and Laboratory Studies. ASTM, STP576. West Conshohocken, Pennsylvania: American Society for Testing and Materials , 132-146.
18.
Suzuki I. ( 1989) Corrosion-Resistant Coating Technology. Corrosion Technology Series. New York: Marcel Dekker .
19.
Vilche JR, Varela FE, Acuna G., Codero EN, Rosales BM, Fernandez A., et al. (1995) A survey of argentinean atmospheric corrosion: I-aluminium and zinc samples. Corrosion Science, 37: 941-961.
20.
Wang J. and Wang Y. ( 2005) Study on potential distribution of atmospheric corrosion using a Scanning Kelvin Probe. Surface Coatings International Part B-Coatings Transactions, 88: 197-200.
21.
Zahner LW ( 1995) Architectural Metals: A Guide to Selection, Specification, and Performance. New York: John Wiley & Sons Inc.
22.
Zhang XG and Huy Q. ( 1995) Tests for simulating atmospheric environments. In: Haynes GS (ed.) Effect of Cyclic Wetting and Drying on Corrosion of Zinc and Steel, Cyclic Cabinet Corrosion Testing. Philadelphia, ASTM, STP1238, West Conshohocken, Pennsylvania: American Society for Testing and Materials, 125-135.
23.
Zhang XG ( 1996) Corrosion and Electrochemistry of Zinc. New York: Plenum Press.
24.
Zheng R., Janssens A., Carmeliet J., Bogaerts W. and Hens H. ( 2004a) An evaluation of highly insulated cold zinc roofs in a moderate humid climate - part I: hygrothermal performance. Construction and Building Materials, 18: 49-59.
25.
Zheng R., Janssens A., Carmeliet J., Bogaerts W. and Hens H. ( 2004b) An evaluation of highly insulated cold zinc roofs in a moderate humid climate - part II: corrosion behavior of zinc sheeting. Construction and Building Materials, 18: 61-71.
26.
Zheng R., Janssens A., Carmeliet J., Bogaerts W. and Hens H. ( 2004c) A hot box-cold box investigation of the corrosion behavior of highly insulated zinc roofing systems. Journal of Thermal Envelope and Building Science, 28: 27-44.
27.
Zheng R., Janssens A., Carmeliet J., Bogaerts W. and Hens H. ( 2010) Performance of highly insulated flat compact zinc roofs in humid-moderate climate regions - part I: hygrothermal behavior. Journal of Building Physics (published online).
