Abstract
Surface nano-crystallization (SNC) of a conform-extruded Cu-0.4 wt.% Mg alloy was successfully conducted by high-speed rotating wire-brushing to obtain the deformed zone with dislocation cells and nanocrystallines. SNC promotes the anodic dissolution and corrosion rate of the Cu-Mg alloy in the initial stage of immersion corrosion in 0.1 M NaCl solution. The weakened corrosion resistance is mainly attributed to the higher corrosion activity of SNC-treated alloy. With extending the immersion time, the SNC-treated alloy slows the corrosion rate dramatically and exhibits uniform dissolution of the surface. The formation of the dense corrosion products leads to the improvement of overall corrosion performance. It indicates that the SNC-treated Cu-Mg alloy can function reliably for a longer duration in a corrosive environment.
Highlights
With the rapid growth of the high-speed railway over the last few decades, more attention has been focused on the development of copper alloys for their high strength, good electrical conductivity, satisfactory resistance to wear, and corrosion for contact wires [1]
After immersion immersion for the some time, the corrosion product up conferred at the surface conferred a protective for some time, corrosion product film piled up film at thepiled surface a protective effect to reduce effect to reduce theFigure corrosion rate
Former investigation on corrosion bahavior of the surface nano-crystallization (SNC)-treated rebar in a simulated solution, In our former investigation on corrosion bahavior of the SNC-treated rebar in concrete-pore a simulated concretewe found that the rebar showed enhanced passivation ability and improved corrosion resistance pore solution, we found that the SNC rebar showed enhanced passivation ability and improved against
Summary
With the rapid growth of the high-speed railway over the last few decades, more attention has been focused on the development of copper alloys for their high strength, good electrical conductivity, satisfactory resistance to wear, and corrosion for contact wires [1]. Compared with other copper alloys, single solid-solution Cu-Mg alloys have good comprehensive performance, a simple manufacturing process, and vast application prospects. In their long-term operation, they can Metals 2018, 8, 765; doi:10.3390/met8100765 www.mdpi.com/journal/metals. Our former investigation found improved passivation ability and corrosion resistance of the SNC-treated low-carbon steel rebar in the Cl− -containing concrete pore solution [16]. As important as it is to develop high-strength, good-conductivity copper contact wires, the present work investigates the corrosion behavior and corrosion resistance of the on-line conformed Cu-0.4wt.%. The SNC-induced special surface microstructure and surface roughness have a close relationship to the evolution in unique corrosion behavior of this alloy
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