Estimation of atmospheric chloride deposition and its corrosion effect in the coastal region of China

Atmospheric chloride deposition rate is the important factor in atmospheric corrosion. However, current research on the distribution of atmospheric chloride deposition in coastal region of China is limited, hindering accurate quantitative analysis of its corrosion effect. We conducted environment monitoring, deposition rate measurement, and metals exposure experiments in coastal region of Hainan Province, China. By analyzing the holistic process of atmospheric chloride, we proposed a deposition rate estimation model considering production, transportation, and deposition (PTD) processes. The proposed PTD regression model significantly improves estimation accuracy and generalizability, achieving an R² of 0.88 on the measured dataset. Additionally, based on environmental exposure experiments, we developed a metal corrosion loss assessment model for coastal region, well-validated on the four metals tested, with all R² values exceeding 0.92. Using these models, we constructed spatial and temporal distribution maps of atmospheric chloride deposition rate and its corrosion effects in coastal region of Hainan Province, China, providing guidance for the corrosion assessment, protection, and maintenance of metal products.