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High-Efficient Liquid Desiccant and Chloride Removal for Corrosion Mitigation and Control


OBJECTIVE: Develop a high-efficient liquid desiccant system with the added capability to remove chloride along with moisture from the atmosphere. The reduction of chloride and humidity will greatly reduce the corrosion potential. DESCRIPTION: Of the $4.5B spent on aircraft corrosion maintenance by the Air Force annually, $1.1B is spent on corrective maintenance for corrosion defects and $3.4B is spent on labor for corrosion related maintenance. Humidity and chloride are key components in forming and accelerating corrosion in all environments. It has been proven that when humidity is maintained below 50% that the corrosion can be prevented. This will ensure that the atmosphere does not allow for the moisture to condense and dissolve the chloride to provide the electrons for the galvanic potential. Corrosion occurs from the chemical reaction on materials when the environmental conditions contain humidity and alkalinity characteristics. Chiefly, aircraft aluminum will break down in humid and salty (sodium chloride) environments from galvanic corrosion. Dehumidification has been shown to reduce corrosion by reducing the humidity to lower levels in the air. But, this technology leaves the chloride in the air which can coat the material. When the metal is moved to a humid location, it potentially has a concentrated amount of chloride covering. By developing a technology that combines dehumidification with chloride removal, we can greatly reduce the galvanic corrosion potential by in effect reducing corrosion related maintenance cost. The goal of this topic is to develop, test and evaluate a dehumidification system which will provide a corrosive-free atmosphere in an aircraft environment. Chloride and environmental sensors will record and validate the reduction of these corrosive elements. This will provide a means to mitigate and control many forms of corrosion, such as uniform, pitting, galvanic, intergranular, exfoliation, filiform, crevice, and concentration cell corrosion. This technology will result in reduced maintenance manhours, reduced labor costs, and reduced cost of corrosion Air Force wide. Additionally, this technology will be adaptable to a variety of military systems within the Air Force and other services. PHASE I: Conceptualize and design a liquid-desiccant system to maintain humidity to below 50% and remove chloride from the atmosphere. Develop chloride and environmental sensors to adequately measure favorable conditions. Develop a case example to demonstrate the technology"s feasibility. Quantify the potential benefits of the technology through appropriate metrics. PHASE II: Develop a prototype of the liquid-desiccant system that will be applied to actual aircraft, support equipment and war readiness materiel, buildings and storage units. PHASE III: Finalize the liquid-desiccant technology implementation with DoD end customer for wide-scale fielding and technical order incorporation. Identify components where such material technologies may be applicable. Develop a technology transition plan and pursue a commercialization agenda. REFERENCES: 1. Salt Free Evaporative Air Conditioning 2. How corrosion is impacted by salt
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