Erosion-corrosion Behavior of Laser-clad Ni-based Alloy Coating on Q235 Carbon Steel

doi:10.11902/1005.4537.2019.157

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (5): 458-462 DOI: 10.11902/1005.4537.2019.157

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Erosion-corrosion Behavior of Laser-clad Ni-based Alloy Coating on Q235 Carbon Steel

WANG Qinying(

),PEI Rui,XI Yuchen

School of Materials Science and Engineering, Southweast Petroleum University, Chengdu 610500, China

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Abstract

Ni-based alloy coating was prepared on the Q235 carbon steel substrate via laser cladding with a high power diode laser. The microstructure, composition and erosion-corrosion behavior of the coating were characterized by means of SEM+EDS and a home-made pipe flow erosion-corrosion tester. The effect of erosion angle and solid particles on the erosion-corrosion behavior of the coating were investigated. Results show that the laser-clad Ni-based alloy coating had uniform microstructure and fewer defects. The erosion-corrosion behavior of the coating was greatly affected by the synergistic effect of the normal stress and shear stress in flow. In addition, the addition of solid particles further reduced the corrosion resistance of the coating.

Key words: laser-clad technology laser-clad Ni-based coating erosion angle solid particle erosion-corrosion behavior

Received: 16 September 2019

ZTFLH:

TG172.2

Fund: National Natural Science Fundation of China(51801167);China Association for Science and Technology Young Talents Supporting Project(2018QNRC001);Southwest Petroleum University of Young Technology Innovation Team(2018CXTD06)

Corresponding Authors: Qinying WANG E-mail: wangqy0401@126.com

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Cite this article:

WANG Qinying,PEI Rui,XI Yuchen. Erosion-corrosion Behavior of Laser-clad Ni-based Alloy Coating on Q235 Carbon Steel. Journal of Chinese Society for Corrosion and protection, 2019, 39(5): 458-462.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2019.157 OR https://www.jcscp.org/EN/Y2019/V39/I5/458

Fig.1 Schematic diagram of pipe flow erosion-corrosion test facility

Table 1 Summary of erosion-corrosion test conditions

Fig.2 Cross-section microscopic morphology of Ni-based laser cladding layer

Fig.3 Microstructure of Ni-based laser cladding layer

Fig.4 Nyquist curves of nickel-based laser cladding layer during the erosion in 3.5%NaCl solution: (a) different angles, (b) without and with solid particles

Fig.5 Potentiodynamic polarization curves of the nickel-based laser cladding layer during the erosion in 3.5%NaCl solution: (a) different angles, (b) without and with solid particles

Table 2 Electrochemical parameters obtained by fitting polarization curves

Fig.6 Micro-morphologies of nickel-based laser cladding layer after the erosion-corrosion in 3.5%NaCl solution at the impact angles of 0° (a), 45° (b) and 90° (c)

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