Tribocorrosion Behavior and Degradation Mechanism of 316L Stainless Steel in Typical Corrosive Media

doi:10.1007/s40195-020-01182-1

Abstract

Abstract:

The tribocorrosion behavior and degradation mechanism of 316L stainless steel, in four typically industrial corrosion media, under different potentials, were studied. The results indicated that they strongly depended on corrosion medium and electrode potential. When the potential increased from cathodic protection region to anodic region, corrosion was accelerated. It dramatically promoted mechanical wear which even dominated the total material loss. As a result, the total material loss increased sharply, though the material degradation directly caused by corrosion was slight. This phenomenon was more noticeable when the media were more aggressive. Especially in NaCl solution, the occurrence of pitting corrosion at anodic potential dramatically accelerated the degradation of the stainless steel. There was a special case in NaOH solution under cathodic protection potential. The corrosive reaction could still occur and couple with wear, which led to the abnormally great material loss compared with that in other corrosion media.

Key words: 316L stainless steel, Tribocorrosion, Wear, Corrosion

Liwen Tan, Zhongwei Wang, Yanlong Ma. Tribocorrosion Behavior and Degradation Mechanism of 316L Stainless Steel in Typical Corrosive Media[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(6): 813-824.

Figures/Tables 17

References 29

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Corrosion medium	i_corr (A cm^-2)	E_corr (V)	β_A	β_C
NaCl	5.12 × 10^-8	- 0.159	0.219	0.052
Na₂SO₄	9.91 × 10^-8	- 0.173	0.325	0.107
H₂SO₄	4.23 × 10^-6	- 0.121	0.160	0.345
NaOH	6.50 × 10^-7	- 0.445	0.429	0.115

Corrosion medium	i_corr (A cm^-2)	E_corr (V)	β_A	β_C
NaCl	5.12 × 10^-8	- 0.159	0.219	0.052
Na₂SO₄	9.91 × 10^-8	- 0.173	0.325	0.107
H₂SO₄	4.23 × 10^-6	- 0.121	0.160	0.345
NaOH	6.50 × 10^-7	- 0.445	0.429	0.115

Corrosion medium	Cathodic potential (V vs. Ag/AgCl)	Anodic potential (V vs. Ag/AgCl)
NaCl	- 0.80	0.22
Na₂SO₄	- 0.80	0.19
H₂SO₄	- 0.60	- 0.09
NaOH	- 0.80	- 0.34

Corrosion medium	Cathodic potential (V vs. Ag/AgCl)	Anodic potential (V vs. Ag/AgCl)
NaCl	- 0.80	0.22
Na₂SO₄	- 0.80	0.19
H₂SO₄	- 0.60	- 0.09
NaOH	- 0.80	- 0.34

Corrosion medium	Potential	Fe (wt%)	Cr (wt%)	Ni (wt%)	Mo (wt%)	O (wt%)	Na (wt%)
None	-	69.43 ± 0.46	18.41 ± 0.53	9.71 ± 0.91	2.44 ± 0.11	-	-
NaCl	CPP	69.16 ± 0.78	18.37 ± 0.07	10.96 ± 1.87	1.79 ± 0.30	0.73 ± 0.10	-
	OCP	67.48 ± 1.10	18.12 ± 0.08	10.04 ± 1.03	2.02 ± 0.29	1.93 ± 1.12	-
	APP	68.28 ± 0.53	20.51 ± 1.71	8.36 ± 1.8	2.01 ± 0.44	0.80 ± 0.29	-
Na₂SO₄	CPP	69.58 ± 0.08	19.04 ± 0.58	9.51 ± 0.58	1.88 ± 0.08	-	-
	OCP	67.47 ± 0.36	17.39 ± 0.12	11.36 ± 0.06	2.47 ± 0.05	1.31 ± 0.13	-
	APP	69.88 ± 0.59	18.94 ± 0.09	8.97 ± 0.34	1.81 ± 0.25	0.42 ± 0.01	-
H₂SO₄	CPP	64.87 ± 1.76	16.46 ± 0.65	13.55 ± 1.22	3.07 ± 0.29	2.04 ± 0.77	-
	OCP	66.37 ± 0.23	18.86 ± 0.40	8.87 ± 0.25	3.30 ± 0.25	2.61 ± 0.24	-
	APP	69.45 ± 0.80	18.72 ± 0	8.94 ± 0.35	1.87 ± 0.10	1.03 ± 0.35	-
NaOH	CPP	66.30 ± 3.93	17.53 ± 0.86	9.22 ± 0.44	1.43 ± 0.05	5.06 ± 5.16	0.45 ± 0.10
	OCP	70.28 ± 1.86	18.31 ± 0.54	9.70 ± 0.67	1.71 ± 0.08	-	-
	APP	59.12 ± 0.31	16.26 ± 0.00	8.68 ± 0.33	0.91 ± 0.15	14.60 ± 0.57	0.44 ± 0.08