Microstructure and flow accelerated corrosion resistance of Cr coatings electrodeposited in a trivalent chromium bath

Wang, Ying; Liu, Yanhong; Li, Guangbin; Zheng, Mingmin; Li, Yusha; Zhang, Anlei; Zhang, Yingchun

doi:10.1016/j.surfcoat.2021.127527

Cited by 5 publications

(1 citation statement)

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“…Various researchers have reported that properties such as strength, wear resistance, and corrosion and erosion resistance have improved with the addition of chromium in these metals and alloys. A Cr-rich oxide film is formed on the surface of these metals and alloys, thus preventing direct contact of the corrosive medium with the base material [ 28 , 29 , 30 , 31 , 32 , 33 , 34 ]. Qin et al [ 35 ] attempted chromium ion implantation on the surface of NAB to modify its surface microstructure.…”

Section: Introductionmentioning

confidence: 99%

A Study of Erosion–Corrosion Behaviour of Friction Stir-Processed Chromium-Reinforced NiAl Bronze Composite

et al. 2022

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Corrosion is frequently viewed as a catastrophic and unavoidable disaster in marine applications. Every year, a huge cost is incurred on the maintenance and repair of corrosion-affected equipment and machinery. In the marine environment, as-cast nickel–aluminium bronze (NAB) is susceptible to selective phase corrosion. To solve this problem, chromium-reinforced nickel–aluminium bronze was fabricated using the friction stir process (FSP) with improved microstructures and surface properties. A slurry erosion–corrosion test on as-cast and FSPed composites demonstrated that the developed surfaced composite has lower erosion and corrosion rates than the as-cast NAB alloy. The erosion–corrosion rate increased with a decrease in the impact angle from 90° to 30° for both as-cast NAB and prepared composites, exhibiting a shear mode of erosion. The specimens at impact angle 30° experienced more pitting action and higher mass loss compared with those at impact angle 90°. Due to increases in the mechanical properties, the FS-processed composite showed higher erosion resistance than the as-cast NAB alloy. Furthermore, corrosion behaviour was also studied via the static immersion corrosion test and electrochemical measurements under 3.5 wt.% NaCl solution. In a static immersion corrosion test, the FSPed composite outperformed the as-cast NAB composite by a wide margin. The FSPed composite also demonstrated a reduced electrochemical corrosion rate, as revealed by the polarization curve and electrochemical impedance spectroscopic (EIS) data. This reduced rate is attributed to the formation of a Cr oxide film over its surface in the corrosive environment.

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