Effects of temperature on corrosion performances
of TiO
2
/SS316L in supercritical water for hydrogen
production
Yuzhen Wang
a,*
, Xiaoqiang Zhang
a
, Fen Gao
a
, Zhuan Liu
a
,
Changqing Fang
a
, Jianqiao Yang
b
, Donghai Xu
b
a
Shaanxi Provincial Key Laboratory of Printing and Packaging Engineering, Xi'an University of Technology, Xi'an,
Shaanxi, 710048, China
b
Key Laboratory of Thermo-Fluid Science and Engineering of MOE, Xi'an Jiaotong University, Xi'an, Shaanxi,
710049, China
highlights
TiO
2
coating was prepared on 316L stainless steel by atmospheric plasma spraying.
Influence of temperature on corrosion resistance of TiO
2
/SS316L in supercritical water was studied.
Temperature mainly increased the diffusion rate of oxygen and water molecules to the substrate.
NiO and NiFe
2
O
4
were generated around the crack on the surface of TiO
2
/316L at 500
C.
article info
Article history:
Received 9 May 2019
Received in revised form
19 June 2019
Accepted 2 July 2019
Available online 31 July 2019
Keywords:
Corrosion
Supercritical water
Hydrogen
Temperature
TiO
2
/SS316L
abstract
Temperature is the most important factor for hydrogen generation during supercritical
water gasification process. However, the increasing temperature could accelerate the
corrosion of the reactor material, at the presence of oxygen, as less amount of oxygen can
promote the hydrogen production. In this study, we prepared a 0.1 mm thick of TiO
2
coating on the surface of 316L stainless steel (SS316L) to enhance the corrosion resistance
of SS316L during hydrogen production process in supercritical water. The influences of
temperature (400e500
C) on surface morphologies and corrosion depth and rate of TiO
2
/
SS316L were evaluated at 25 MPa with 1000 mg/L oxygen for 80h. Results showed that
cracks and pores were present on the surface of TiO
2
/SS316L after corroded in SCW for 80h.
The crack width and corrosion rate was aggravated at higher temperature. The remained
thickness of the coating at 400
C, 450
C, 500
C were 0.08 mm, 0.05 mm and 0.03 mm,
respectively. NiO and NiFe
2
O
4
were generated around the crack on the surface of TiO
2
/316L
at 500
C, the coating had a tendency to peel off the substrate.
© 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
* Corresponding author.
E-mail address: yzwang@xaut.edu.cn (Y. Wang).
Available online at www.sciencedirect.com
ScienceDirect
journal homepage: www.elsevier.com/locate/he
international journal of hydrogen energy 44 (2019) 25112 e25118
https://doi.org/10.1016/j.ijhydene.2019.07.012
0360-3199/© 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.