Tribocorrosion Behavior of 304 Stainless Steel in 0.5 mol/L Sulfuric Acid

doi:10.1007/s40195-018-0773-x

Abstract

Abstract:

The tribocorrosion behavior of 304 stainless steel was studied through comparing the damage behavior of 304 stainless steel in dilute sulfuric acid to that in distilled water by a reciprocating tribotester. The re-passivation behavior, the surface and sectional morphological features, as well as the change of microhardness of samples were studied, and the tribocorrosion mechanism was also discussed. The experimental results reveal that the damage of stainless steel in dilute sulfuric acid was caused by the steel’s mechanical removal and electrochemical dissolution. The wear mechanism of stainless steel is abrasive wear, which mainly consists of micro-cutting and peeling. The synergetic action between corrosion and wear is notable. The corrosive environment leads to the embrittlement of the surface layer, and the wear destroys the passivation film and causes galvanic corrosion.

Key words: Stainless steel, Tribocorrosion, Synergetic action, Reciprocating wear test, Re-passivation

Ming Liu, De-Li Duan, Sheng-Li Jiang, Ming-Yang Li, Shu Li. Tribocorrosion Behavior of 304 Stainless Steel in 0.5 mol/L Sulfuric Acid[J]. Acta Metallurgica Sinica (English Letters), 2018, 31(10): 1049-1058.

Figures/Tables 13

Table 1 Chemical composition of 304 stainless steel (wt%)

C	Mn	P	S	Si	Cr	Ni	Fe
0.045	1.05	0.03	0.01	0.50	17.9	8.00	Bal.

Fig. 1 Metallographic structure of 304 stainless steel

Fig. 2 Schematic diagram of a reciprocating tribotester: 1-slide rail; 2-drive rod; 3-motor; 4-upper sample; 5-upper sample clamp; 6-sample; 7-sample cell; 8- sensor for friction force; 9-control box; 10-computer; 11-normal force inductor; 12-hydraulic presser

Fig. 3 Weight loss of 304 stainless steel in 0.5 mol/L H2SO4 (a); distilled water (b)

Fig. 4 Relationship among the friction factor of 304 stainless steel, load, frequency and environmental media: a 30 N in 0.5 mol/L H2SO4; b 1 Hz in 0.5 mol/L H2SO4; c 1 Hz in 0.5 mol/L H2SO4, distilled water

Fig. 5 SEM surface morphologies of wear scars in 304 stainless steel: a 30 N and 2 Hz in distilled H2O; b 30 N and 2 Hz in 0.5 mol/L H2SO4; c 60 N and 2 Hz in distilled H2O; d 60 N and 2 Hz in 0.5 mol/L H2SO4; e 90 N and 2 Hz in distilled H2O; f 90 N and 2 Hz in 0.5 mol/L H2SO4

Fig. 6 Hardness distribution of a worn cross section of 304 stainless steel

Fig. 7 SEM cross-sectional images of the wear scars in 304 stainless steel: a 90 N and 1 Hz, in 0.5 mol/L H2SO4; b 90 N and 2 Hz in 0.5 mol/L H2SO4; c 90 N and 1 Hz in distilled H2O; d 90 N and 2 Hz in distilled H2O

Fig. 8 Surface micro-morphology of wear scars in stainless steel (60 N and 1 Hz in 0.5 mol/L H2SO4)

Fig. 9 Polarization curves of stainless steel: a distilled water; b 0.5 mol/L sulfuric acid

Fig. 10 Re-passivation curves of 304 stainless steel in water and 0.5 mol/L sulfuric acid

Table 2 Content of each element on the surface of the grinding mark (wt%)

Element	O	Si	Cr	Mn	Ni	Fe
Distilled H₂O	7.55	2.24	17.12	0.79	6.9	65.4
H₂SO₄	3.02	1.04	17.49	0.87	8.75	68.83

Fig. 11 Relationship among the interaction amount of 304 stainless steel, the reciprocating frequency and load

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