New hybrid organic-inorganic conversion coating applied on the Al2024 substrate: Electrochemical, adhesion and surface study
Source abstract
Abstract
Health problems caused by chromate conversion coatings promoted new research for discovering environmentally-friendly conversion coatings. In this study, Ti-Zr conversion coating (Ti-Zr) was deposited on the aluminum surface in the presence of nickel sulfate (Ti-Zr-Ni) and adipic acid (Ti-Zr-AA). Polarization and electrochemical impedance spectroscopy (EIS) measurements were employed to evaluate the anti-corrosion properties. Surface analysis was carried out using field emission scanning electron microscope (FE-SEM) and Atomic force microscopy (AFM). The results revealed that the Ti-Zr-Ni treatment inhibited the corrosion progression to a significant degree. The polarization resistance showed a significant increase (R p= 58835 ohm.cm 2) in Ti-Zr-Ni treatment in comparison with Ti-Zr conversion coating (R p= 4450 ohm.cm 2) and Ti-Zr-AA sample (R p= 15058 ohm.cm 2). The presence of Ni in the Ti-Zr composition, not just gave rise to the synergism but also played an important role as catalyst to further help avoiding further material degradation. Moreover, the presence of additives (nickel sulfate and adipic acid) enhanced the anti-corrosion resistance of coating by modification of surface morphology according to FE-SEM and AFM images. Anti-corrosion properties and adhesion strength of samples in a fully coated system were also investigated by EIS and pull-off tests, respectively, which revealed that the delamination of the Ti-Zr-Ni sample was lowest among others, and this sample showed better barrier performance even after 6 weeks of immersion in the corrosive environment.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Corrosion Behavior and Inhibition · Concrete Corrosion and Durability · Electrodeposition and Electroless Coatings
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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