Overview
ISO/TR 8547:2024 - Corrosion of metals and alloys: Exposure test results in the Asian Monsoon region - is a technical report that compiles measured corrosion and environmental data from exposure tests conducted under the “e-Asia Project.” The document presents results for carbon steel and galvanized steel sheet at 36+ test sites across Japan, Vietnam and Thailand, providing practical information on atmospheric corrosivity in monsoon-affected climates.
Key topics
- Scope and test programme
- Outdoor exposure of carbon steel (3 mm thick, 70 × 150 mm, both sides exposed) and galvanized steel sheet (1 mm thick, 70 × 150 mm, one side exposed with back/edges protected).
- 16 sites in Japan, 13 in Vietnam and 7 in Thailand with skyward/groundward orientations.
- Test and measurement methods
- Corrosion products removed and weight loss measured following ISO 8407 to determine corrosion rates.
- Environmental monitoring: airborne salinity (Cl) by “Dry gauze”, SO2 by “PbO cylinder” per JIS Z 2382, and meteorological logging (temperature, relative humidity, rainfall, ACM sensor outputs).
- Conversion of JIS-derived Cl (S) and SO (P) deposition to ISO 9225:2012 equivalents (S = 2.4·S(JIS), P = 0.67·P(JIS)).
- Corrosion behaviour findings
- Carbon steel corrosion rates (CR[CS]) mostly fall into ISO 9223 corrosivity categories C2–C3 (≈10–400 g/m²·y), with some coastal sites (Miyakojima, Phangnga) reaching C4 (≈400–650 g/m²·y).
- CR[CS] shows a peak around ~20 °C in this dataset, increases with rainfall and Cl deposition, but is not strongly correlated with relative humidity or SO deposition in these sites.
- Zinc (CR[Zn]) corrosion rates are generally **