Key Takeaways & Executive Findings
- •• • 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.
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Abstract
A double-bridge connection method is proposed for rapid determination of the equivalent accelerated relationship between laboratory accelerated corrosion environment spectrum and actual atmospheric exposure for aviation aluminum alloys. The method employs corrosion electricity and corrosion weight loss as equivalent parameters, enabling calculation of the equivalent acceleration relationship without long-term outdoor exposure test pieces, using atmospheric environment monitoring data, laboratory corrosion weight loss tests, and short-term atmospheric exposure results. For ZL114A aluminum alloy, 10-year atmospheric monitoring data from a tropical marine environment were processed to compile climatic and chemical environment spectra. A laboratory accelerated corrosion environment spectrum was prepared via weighted concentration of environmental factors. Atmospheric corrosion monitoring (ACM) and electrochemical workstation measurements determined corrosion current and conversion coefficients under varying temperature, humidity, and acid solution conditions. The cumulative corrosion electricity for 10-year island atmospheric exposure was 3,050,339.15 C. Laboratory weight loss tests yielded the average corrosion weight loss rate per unit area. The equivalent acceleration relationship for ZL114A alloy under the compiled spectrum was 74 h/a. Verification via SEM, CT scanning, and fatigue testing compared surface damage morphology, pit dimensions, fatigue life, and fracture morphology of specimens exposed to atmospheric conditions for 6 months, 1 year, and laboratory accelerated corrosion for 72 h. Results confirm identical corrosion damage modes and severity consistent with the derived equivalent acceleration relationship. The 72 h accelerated specimens exhibited damage between 6-month and 1-year atmospheric exposures, closer to 1-year exposure, validating the method's feasibility.
1. Introduction
Aviation aluminum alloys, particularly ZL114A, face atmospheric corrosion failure in tropical marine environments, where high humidity, chloride deposition, and temperature fluctuations accelerate pitting and fatigue crack initiation. Traditional qualification relies on long-term outdoor exposure tests spanning multiple years, which are costly, site-specific, and incompatible with rapid material development cycles. Existing accelerated corrosion methods often lack quantitative equivalence to actual atmospheric degradation, leading to over- or under-conservative life predictions and uncertain maintenance schedules.
This study addresses the bottleneck by proposing a double-bridge connection method that links laboratory accelerated corrosion to real atmospheric exposure through two equivalent parameters: corrosion electricity and corrosion weight loss. By compiling a 10-year environmental spectrum and using ACM and electrochemical measurements, the method calculates cumulative corrosion electricity and derives an equivalent acceleration relationship without long-term exposure test pieces. For ZL114A alloy, the relationship is 74 h/a, validated by SEM, CT, and fatigue tests showing that 72 h accelerated corrosion replicates damage between 6-month and 1-year atmospheric exposures. This protocol enables rapid, quantitative corrosion qualification for aviation alloys.
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ZHANG Teng, WANG Changkai, ZHANG Tianyu, HE Yuting (2026). Accelerated Corrosion of Aluminum Alloy and Determination Method of Equivalent Accelerated Relationship. Surface Technology (表面技术). https://doi.org/10.16490/j.cnki.issn.1001-3660.2026.12.003
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Frequently Asked Questions
What is the quantitative basis for the 74 h/a equivalent acceleration relationship, and how was it validated?
The relationship was derived using corrosion electricity as the equivalent parameter. Cumulative corrosion electricity for 10-year atmospheric exposure was 3,050,339.15 C, measured via ACM and electrochemical workstation under varying temperature, humidity, and acid conditions. Laboratory weight loss tests provided the average corrosion weight loss rate per unit area. The ratio of these parameters yielded 74 h/a. Validation involved comparing 72 h accelerated specimens with 6-month and 1-year atmospheric exposures using SEM, CT, and fatigue tests. The 72 h specimens showed damage morphology, pit dimensions, and fatigue life intermediate between the two exposure durations, closer to 1-year exposure, confirming the equivalence.
How does the double-bridge connection method eliminate the need for long-term outdoor exposure test pieces?
The method uses two bridges: the electricity (current) equivalent bridge and the weight loss equivalent bridge. The electricity bridge links short-term atmospheric ACM measurements to long-term cumulative corrosion electricity via conversion coefficients derived from laboratory electrochemical tests under controlled temperature, humidity, and acid conditions. The weight loss bridge connects laboratory weight loss tests to atmospheric corrosion weight loss. By combining these bridges, the equivalent acceleration relationship is calculated from monitoring data, laboratory tests, and short-term exposure results, bypassing the need for multi-year outdoor exposure specimens.
What are the limitations of the accelerated corrosion environment spectrum in replicating actual tropical marine atmospheric conditions?
The spectrum was compiled using weighted concentration of environmental factors based on 10-year monitoring data, including climatic and chemical parameters. However, it may not capture stochastic events such as typhoons, seasonal variations in pollutant deposition, or synergistic effects of multiple corrosive species. The validation showed that 72 h accelerated corrosion produced damage closer to 1-year exposure, but the equivalence is specific to ZL114A alloy and the studied tropical marine site. Extrapolation to other alloys or environments requires recalibration of conversion coefficients and cumulative corrosion electricity.
What is the industrial impact of reducing corrosion qualification time from years to 74 hours per year of exposure?
The 74 h/a relationship compresses one year of atmospheric corrosion into approximately three days of laboratory testing. This accelerates material selection, coating development, and life prediction for aviation components, reducing costs associated with outdoor exposure facilities and shortening development cycles. It enables rapid screening of alloys and surface treatments under simulated tropical marine conditions, supporting timely maintenance scheduling and design improvements. The quantitative equivalence also provides a defensible basis for regulatory acceptance of accelerated test data in lieu of long-term field exposure.
How does the corrosion electricity parameter compare to traditional weight loss measurements in terms of sensitivity and reliability?
Corrosion electricity, measured via ACM and electrochemical techniques, offers real-time monitoring of corrosion rate and cumulative damage, capturing transient effects that weight loss may average out. For ZL114A alloy, cumulative corrosion electricity over 10 years was 3,050,339.15 C, providing a high-resolution metric. Weight loss, while direct, requires destructive testing and longer exposure to yield measurable mass changes. The double-bridge method leverages both: electricity for continuous monitoring and weight loss for validation, enhancing reliability and enabling cross-checking of equivalent acceleration relationships.
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