Corrosion behaviours of arc-sprayed AlSi-based amorphous/nanocrystalline coating

ABSTRACT

The aim of this article is to investigate the corrosion behaviours of arc-sprayed AlSiFeNiRE amorphous/nanocrystalline coating under different solution temperatures and different solution flow velocities. All tests were measured by CHI660E electrochemical workstation. The microstructure of the coating was characterized by scanning electron microscope (SEM) and the phase structure of the coating was examined using an X-ray diffraction (XRD) appliance. The morphologies and compositions of the coatings after immersion were analysed by SEM equipped with energy-dispersive spectrometer (EDS). The results show that the corrosion resistance of the coating increases first and then decreases with the prolonging of immersion time in long-term immersion. When the immersion reaches 10 days, the coating displays the lowest corrosion rate. With increasing solution temperature, the corrosion resistance of the coating decreases at first and then increases. The corrosion resistance of the coating decreases gradually as a function of the flow velocity.

KEYWORDS:

• Corrosion
• Al-based amorphous/nanocrystalline coating
• long-term immersion
• temperature
• flow velocity

Acknowledgements

This project is supported by National Key R&D Program of China (Grant No. 2018YFC1902404), National Natural Science Foundation of China (Grant No. 51975183), and Jiangsu Provincial Key Research and Development Program, China (Grant No. BE2019077).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This project is supported by National Key R&D Program of China [grant number 2018YFC1902404], National Natural Science Foundation of China [grant number 51975183], and Jiangsu Provincial Key Research and Development Program, China [grant number BE2019077].