Specialized Electrochemical Test Methods to Measure Polarization Curves Under Atmospheric Conditions
Abstract
Specialized Electrochemical Test Methods to Measure Polarization Curves Under Atmospheric Conditions James F. Dante Southwest Research Institute 6220 Culebra Rd. San Antonio, TX 78240 Abstract Corrosion prevention and control is a major cost driver for naval aviation, accounting for $3B in 2007/2008. Controlling corrosion is critical for structural integrity. The combined effects of environment and loading experienced by Naval aircraft may also accelerate protection system breakdown and support the transition of localized corrosion damage to environment assisted cracking (EAC) and corrosion fatigue. It is observed, for example, that nearly 90% of cracks found in naval aviation systems are associated with galvanic corrosion attack. Enhanced knowledge and models for alloy corrosion and galvanic corrosion will be useful for the design of new more durable systems, inhibitor selection, surface modification, and prognosis for asset management. To develop these models, the acquisition of relevant electrochemical data is required. In the case of atmospheric corrosion, electrochemical parameters gathered under immersion conditions are inadequate to describe the electrochemical processes occurring under the thin film electrolytes that form during atmospheric exposures. The objective of this effort is to establish a simple means to acquire atmospheric electrochemical data. To demonstrate the validity of these electrochemical measurements, a model of the exposed surfaces will be developed and the gathered polarization data will be used as input to predict the corrosion response under similar conditions. The model output will be compared with actual measurements. A correct prediction of MMA output will act to validate both the model and the electrochemical input and, by extension, the measurement method. The development of a durable method for data acquisition will enable widespread measurement of directly comparable data which is immediately relevant to the atmospheric exposures most relevant to sea-based aviation equipment.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 12, 2016
- Source ID
- N000141512033
Entities
People
- James Dante
Organizations
- Office of Naval Research
- Southwest Research Institute
- United States Navy