Multimetal Corrosion Control for Otto Fuel Tanks and Engines

The MK-48 torpedo was originally developed in the 1960s and went into active service in 1971. It is designed to combat both enemy nuclear submarines and high performance surface ships. Through a series of modifications, the offensive capability of the torpedo has kept up with advances in enemy military technology. Maintaining the MK-48 torpedo presents unique challenges. Torpedoes can be used multiple times for training and exercises. After such exercises, they must return to Intermediate Maintenance Activities (IMA) for turn-around before sea-water and exhaust products cause extensive corrosion damage. Corrosion control in the MK 48 torpedo is challenging since it is uses both 7000 series aluminum alloys (a corrodible alloy because it contains copper for strengthening) and stainless steel. In addition, many interfaces are sealed by o-rings, which can form spaces or crevices that trap seawater and/or corrosive exhaust products. It is estimated that 25% of the work involves corrosion mitigation. If the corrosion can be eliminated or slowed down a significant portion the IMA may be reduced or eliminated. Using computational algorithms and bench testing TDA will identify corrosion inhibitors that can be added to the fuel mixture to stop corrosion and reduce maintenance costs.