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AZ31 (UNS M11311) is a wrought magnesium alloy used in aerospace and automotive applications. In this work, KOH-based electrolytes were used to study the corrosion behavior of AZ31 alloy in highly alkaline environment. The effect of dopants and exposure time on pit initiation was studied via optical and scanning electron microscopy.
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From stress corrosion cracking of baffle-former bolts to radiological hazards from Co-60, corrosion of structural materials is the root of many operational issues that occur in light water nuclear reactors. Corrosion must be controlled to mitigate the risks of larger problems that reduce the operational time and lifespan of a reactor. One fundamental feature of nuclear reactors is the radiation field which is known to impact corrosion behavior. However, there is a severe lack of understanding the underlying mechanisms of radiation effects on corrosion, especially for stainless steels. Ion irradiation experiments allow for the controlled study of radiation effects on corrosion and to compensate for the lack of reactor data on structural materials.
Corrosion costs the US Department of Defense billions of dollars annually, with the impact of corrosion estimated at $20.6B in fiscal year 2016. It continues to be one of the leading causes of aircraft unavailability and accounts for a significant portion of maintenance labor and costs. Corrosion management practices are chosen to minimize maintenance costs while maximizing the availability of an asset.
Exterior decorative aerospace livery coatings are designed to be resistant to UV degradation as well as inert to a variety of aggressive solvents and airplane fluids to ensure adequate protection of the airframe. These coatings are also used to project a commercial airline’s identity using multiple overlapping colors in complex designs
The corrosion severity of an environment is important for both design and maintenance of infrastructure especially in marine and costal environments. Corrosion can vary drastically depending on conditions such as temperature, humidity, salt loading, and rain events.1 The interplay between these variables is quite complex so a variety of indirect techniques for quantifying corrosion severity are typically used. One common method is the determination of corrosion rate by measuring the mass loss of steel coupons exposed in the field. Measuring the change in mass of the steel coupon as a result of the corrosion product being removed from the substrate can provide the rate of corrosion after a specific exposure time in the field.
Accurate representations of the thermochemistry and phase equilibria of relevant molten salt constituents and their aggregate behavior are critical to the development, design, operation, and licensing of any molten salt reactor (MSR). This need is currently being addressed by the creation of a dedicated, high quality/validated MSR thermochemical database, the Molten Salt Thermal Properties Database-Thermochemical (MSTDB-TC). MSTDB-TC is being populated with prioritized models and values for vapor species, and liquid and crystalline phases of chloride and fluoride fuel and coolant salts with relevant fission product and transuranic elements, and more recently with corrosion-relevant systems with chromium, iron, and nickel. Multi-cation crystalline and melt solution models are being incorporated, including newly developed relations as necessary, to obtain real system behavior.
Departmant of Defense Specifications/standards for the prevention and control of corrosion in the aerospace field.
This paper summarizes work performed to evaluate a phenomenon that can occur in electrical cable insulation polymers during the aging process. This phenomenon, the copper catalytic effect, occurs because of diffusion of copper ions from the conductor into the insulation polymers during the aging process. In this research, the copper catalytic effects observed in cross-linked polyethylene, cross-linked polyolefin, and ethylene propylene rubber insulation subjected to thermal accelerated aging at both 120˚C and 130 ˚C were evaluated. In addition, the insulation polymers from cables removed from service in operating nuclear power plants were also evaluated to determine if this effect is prevalent for naturally aged materials. The results acquired from this work were used to characterize the copper catalytic effects observed in these polymers, analyze how this phenomenon affects the degradation process of the materials, and determine the impact that the copper catalytic effect has on condition monitoring data acquired during the aging process.
Corrosion protection at NASA’s Kennedy Space Center is a high priority item. The launch facilities at the Kennedy Space Center are located approximately 1000 feet from the Atlantic Ocean where they are exposed to salt deposits, high humidity, high UV degradation, and acidic exhaust from solid rocket boosters. These assets are constructed from carbon steel, which requires a suitable coating to provide long-term protection to reduce corrosion and its associated costs.
Army Regulation (AR) 11-42, Army Corrosion Prevention and Control Program, requires that program managers and engineers use a risk-based approach (RBA) to identify the corrosion susceptibility on critical components and the consequence to the overall system. Department of the Army Pamphlet (DA PAM) 11-42 provides an example of generic procedures for conducting a risk-based approach. The goal of this project was to develop a detailed, standardized process for conducting a risk-based approach during CPC planning.
Aerospace Coatings is rapidly becoming more complex as a technical discipline. Professional certification of Aerospace Coatings Technicians, to an industry standard, is now possible and going forward, should not be regarded as optional for Aerospace Coatings operations.