Accelerated Corrosion of Aluminum Alloy and Determination Method of Equivalent Accelerated Relationship

• • The double-bridge connection method establishes an equivalent acceleration relationship of 74 h/a for ZL114A aluminum alloy, meaning 74 hours of laboratory accelerated corrosion replicates one year of tropical marine atmospheric exposure. This eliminates the need for multi-year outdoor exposure tests, reducing material qualification timelines from years to weeks and accelerating alloy deployment in aerospace applications. • • Cumulative corrosion electricity for 10-year atmospheric exposure of ZL114A alloy was determined as 3,050,339.15 C, derived from ACM and electrochemical measurements under varying temperature, humidity, and acid conditions. This quantitative metric enables predictive modeling of corrosion damage and serves as a transferable parameter for other aluminum alloys in similar environments. • • Laboratory accelerated corrosion for 72 h produced surface damage morphology, pit dimensions, and fatigue life intermediate between 6-month and 1-year atmospheric exposures, with closer proximity to 1-year exposure. This validates the equivalent acceleration relationship and demonstrates that accelerated testing can reliably replicate long-term atmospheric degradation, supporting fatigue life prediction and structural integrity assessments. • • The method integrates climatic and chemical environment spectra compiled from 10 years of monitoring data, using weighted concentration of environmental factors to simulate tropical marine conditions. This systematic approach provides a template for developing accelerated corrosion protocols for other alloys and environments, reducing reliance on costly and time-consuming field exposures.