Premium
Galvanic corrosion of aluminum wrought alloys in integral hybrid components with carbon fiber reinforced plastics (CFRP) and titanium
Author(s) -
Mehner Andreas,
von Hehl Axel,
Zoch HansWerner
Publication year - 2018
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201709658
Subject(s) - materials science , galvanic corrosion , galvanic cell , corrosion , titanium , metallurgy , aluminium , carbon steel , composite material
Integral joints of aluminum with carbon fiber reinforced plastics (CFRPs) could help to reduce the weight of modern light weight constructions and also allow new constructions compared to the conventional riveting technology used nowadays. Aluminum–CFRP and aluminum–titanium joints frequently show galvanic corrosion if these materials are in electrical contact and if both are exposed to humidity or a watery environment. Therefore, the aim of the research in this study was the evaluation of the susceptibility to galvanic corrosion for the different aluminum wrought alloys EN AW‐5083, EN AW‐6082, and EN AW‐6056 in contact with titanium grade 2 and/or with carbon fibers. Salt spray tests of the alloys and joints of these alloys with carbon fibers and titanium confirmed the negative impact of galvanic corrosion. The alloys EN AW‐5083 and AW‐6082 with the highest corrosion resistance showed the strongest impact due to galvanic corrosion. The metallographic characterization of the corrosion attack and electrochemical measurements of the open circuit potentials and potentiodynamic polarization measurements in aerated artificial sea water revealed deeper insight into the electrochemical mechanisms for galvanic corrosion of these alloys due to contact with titanium or carbon fibers.