Spatial Modeling of Atmospheric Corrosion Risk on Metallic Infrastructure in Coastal Industrial Zones: Integration of Air Salinity Levels and Material Degradation Rate Statistics

Abstract

Atmospheric corrosion is one of the major environmental problems affecting metallic infrastructure in coastal industrial regions. High humidity, airborne chloride particles, industrial emissions, and tropical climate conditions can accelerate the degradation of metallic materials exposed to the atmosphere. This study aimed to analyze and spatially model atmospheric corrosion risk in coastal industrial zones by integrating air salinity levels and material degradation rate statistics. The study focused on industrial coastal areas in Palembang–Sungsang coastal corridors and Banyuasin coastal regions, South Sumatra, Indonesia. Secondary data were obtained from BMKG climate reports, environmental monitoring data, and previous corrosion studies published between 2019 and 2025. Geographic Information System (GIS)-based spatial analysis using the Inverse Distance Weighting (IDW) method was applied to estimate salinity distribution and corrosion vulnerability. Corrosion classification referred to ISO 9223 atmospheric corrosivity standards. The results showed that coastal industrial areas located near estuary and shoreline regions experienced higher airborne chloride deposition and higher corrosion categories ranging from C3 to C5. Statistical analysis indicated a strong positive relationship between air salinity and corrosion rate with correlation values above .80. High humidity and industrial activity intensified atmospheric corrosion severity. The study demonstrates that spatial modeling can support industrial infrastructure maintenance planning and environmental risk mitigation in Indonesian coastal industrial areas.