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Corrosion on Noble, Active, and Passivating Metals Galvanically Coupled to Aluminum.

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Title:Corrosion on Noble, Active, and Passivating Metals Galvanically Coupled to Aluminum.
Authors:Ling, Sonya M. G.
Contributors:Mechanical Engineering (department)
Date Issued:May 2018
Publisher:University of Hawaiʻi at Mānoa
Abstract:Aluminum is a readily available metal and can be alloyed to produce a material suitable for many applications. Its material properties and corrosion resistance has made it a popular alloy, especially for applications requiring lightweight materials. However, due to its active location in the galvanic series and EMF series, it can be very susceptible to galvanic corrosion. Hence, there have been many studies on the galvanic corrosion of aluminum coupled to more noble metals in the galvanic and EMF series. It is generally assumed that the noble metal in the galvanic couple with aluminum is cathodically protected and immune to corrosion. In an extensive galvanic corrosion study that was recently conducted (in diverse environments in Hawaii and in an accelerated corrosion test chamber) on aluminum coupled to noble (copper and silver) metals, various noble passivating (316 stainless steel and titanium 6Al-4V) alloys, a non-passivating (1018 carbon steel) alloy, significant amounts of corrosion product from plain carbon steel and even noble silver and copper metals were found on aluminum. In this study, the corrosion of the cathodic metals in the couple (i.e., silver, copper, 316 SS, Ti-6Al-4V, and 1018 mild steel), which have often been neglected, have been studied using 3-dimensional profilometry, x-ray diffraction, and weight loss to determine the extent of corrosion. Even miniscule amounts of corrosion product produced by the cathode can have significant effects on the corrosion of the anode aluminum.
Description:M.S. Thesis. University of Hawaiʻi at Mānoa 2018.
Rights:All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
Appears in Collections: M.S. - Mechanical Engineering

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