Comparative Dynamic Analysis on Different Corrosion Damage Characterizations of ZL105 in Immersion Environment

Abstract

Corrosion damage has a severe impact on security and reliability of the aircraft components. It is worthy to study environment suitability of the materials for planes transferring along the coast annually. The corrosion damage of the aluminum alloy ZL105 in the corrosive immersion environment was studied by referring to the environment parameters of the accelerated corrosion test spectrum. In order to obtain the average pitting depth and surface self-corrosion current density, the corrosion damage morphology was observed and electrochemical measurements after every immersion cycle were carried out. By fitting analysis, corrosion dynamics curves of corrosion rate symbolized by average pit depth and surface self-corrosion current density were acquired. Meanwhile, a quantitative comparison was implemented to analyze change rules of the two corrosion rates by using non-dimensional normalization, and it was figured out that the two normalized corrosion rates had a significant correlation and the correlation parameter was 0.969. Differences of the two curves were reasonably explained according to ZL105 corrosion damage morphology observations and the relevant mathematical pitting model.

Keywords

• average corrosion pitting depth
• linear polarization
• aluminum alloy ZL105
• self-corrosion current density
• normalization analysis