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Chinese Journal of Materials Research  2017, Vol. 31 Issue (9): 665-671    DOI: 10.11901/1005.3093.2016.662
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Localized Corrosion Resistance of Three Commonly-used Stainless Steels
Jingli SUN1,2(), Dan ZOU1, Jing JIN1, Li LI1, Haiying LIU1
1 Shanghai Aerospace Equipment Manufacturer, Shanghai 200245, China
2 Shanghai Spaceflight Precision Machinery Institute, Shanghai 201600, China
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Jingli SUN, Dan ZOU, Jing JIN, Li LI, Haiying LIU. Localized Corrosion Resistance of Three Commonly-used Stainless Steels. Chinese Journal of Materials Research, 2017, 31(9): 665-671.

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Abstract  

Three kinds of austenitic steels 1Cr18Ni9Ti, 304 and 316L all contain different minor elements. The localized corrosion behavior of them was comparatively investigated, including intergranular corrosion, pitting corrosion and stress corrosion. Results show that the addition of Ti and the low C content are beneficial to the enhancement of intergranular corrosion resistance of the steel. Among others, the solution treated 304 steel has the best pitting corrosion resistance owing to the highest content of Cr and N, while 316L steel has the best stress corrosion resistance in 42% boiling MgCl2 because of its high Ni content.
Key words:  materials failure and protection      localized corrosion      potentiodynamic polarization technique      intergranular corrosion test      slow strain rate test      minor elements     
Received:  10 November 2016     
ZTFLH:  TB304  
Fund: Supported by Shanghai Pujiang Program (No.15PJ1433600) and One of the Technical Basis Projects of Shanghai Academy of Spaceflight Technology
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Jingli SUN
Dan ZOU
Jing JIN
Li LI
Haiying LIU

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.662     OR     https://www.cjmr.org/EN/Y2017/V31/I9/665

Alloy C P S Cr Ni Ti Mo N
1Cr18Ni9Ti 0.023 0.017 0.002 17.39 9.04 0.197 ─ ─
304 0.051 0.028 0.002 18.05 8.23 ─ ─ 0.04
316L 0.019 0.03 0.003 16.83 10.07 ─ 2.05 0.01
Table 1  Chemical composition of three kinds of austenitic stainless steel (%, mass fraction, Fe rest)
Fig.1  Photographs of bended stainless steels at sensitization state after intergranular corrosion test (a)-(c) front view, (d)-(f) side view
Fig.2  Mettallographic photos of typical microstructures of three kinds of steels after intergranular corrosion test: (a)-(c) bending area, (d)-(f) flat area, (g)-(i) grain boundary area
Fig.3  Potential dynamic polarization curves of 1Cr18Ni9Ti, 304 and 316L stainless steels in 3.5% NaCl solution at room temperature
Alloy Ecorr /V Icorr /Acm-2 Eb /V
1Cr18Ni9Ti -0.215 7.44×10-8 0.092
304 -0.282 1.69×10-7 0.413
316L -0.164 5.38×10-8 0.268
Table2  Characteristics of polarization curves for three kinds of steels in 3.5% NaCl solution, room temperature
Fig.4  Micrographs of the stainless steels after pitting corrosion in 3.5wt.% NaCl solution (a) and (b) 1Cr18Ni9Ti; (c) and (d) 304; (e) and (f) 316L
Sample Rm/MPa A/% R'm/MPa A'/% ISSRT
1Cr18Ni9Ti-1# 660 59.5 430 54.5 0.366
1Cr18Ni9Ti-2# 658 59.0 433 54.0
304-1# 632 83.5 479 59.5 0.35
304-2# 631 84 470 58.5
316L-1# 563 70 461 58.5 0.266
316L-2# 572 78.5 452 59.5
Table 3  Results of stress corrosion experiment by slow strain rate test technique
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