Enhanced Pitting Corrosion Resistance of 304 SS in 3.5 wt% NaCl by Ultrasonic Nanocrystal Surface Modification

Li, Shengxi; Ren, Zhencheng; Dong, Yalin; Ye, Chang; Cheng, Gang; Cong, Hongbo

doi:10.1149/2.1781712jes

Cited by 19 publications

(12 citation statements)

References 65 publications

(114 reference statements)

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“…Plastic deformation also affects corrosion behavior through other effects such as alteration of the solute element distribution, 55,56) the partial or complete dissolution of precipitates 57 and their physical fragmentation, 5769) phase transformation, 70,71) texture change, 37,7275) and residual stress enhancement. 41,73,74,76,77) We limit ourselves to simple materials, such as pure metals and single-phase alloys so that we can neglect the very complex effect of chemical inhomogeneity, and rather focus on the effect of the evolution of deformation-induced microstructures in severely deformed materials.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of Severely Deformed Pure and Single-Phase Materials

et al. 2019

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The significant and complex effect of plastic deformation on corrosion behavior involves changes in not only dislocation density but also other metallurgical factors such as grain size, texture, chemical inhomogeneity, phase transformation and residual stress. With the advent of severe plastic deformation (SPD), the effect of plastic deformation on corrosion in the ultrahigh strain range is becoming an important issue. However, our understanding of corrosion properties of SPD materials lags far behind than that of their other properties, e.g. their mechanical properties. In this review, the role of dislocations and grain boundaries generated by SPD was highlighted in pure metals and single-phase materials, where plastic deformation and grain refinement proceed mainly by dislocation activity. Accordingly, the complicated effect of chemical inhomogeneity arising from impurity segregation and precipitation was excluded from discussion, while other implicit effects were included. It is essential to elucidate the effect of so-called ultrafine-grained (UFG) structures which develop progressively to a saturation over a very wide strain range. Unfortunately, the literature mainly compares the corrosion behavior of UFG and coarse-grained (CG) materials, and the degree of perfection of UFG formation and the resultant effects on corrosion vary between studies. The limited number of studies that examines corrosion behavior systematically over a wide strain range suggests that, in most cases, the effect of plastic deformation on corrosion extends into the SPD region gradually, with no anomalous change. That is, SPD improves the corrosion resistance to further degree in a passive environment, whereas it increases the dissolution rate in a non-passive environment. However, several works reported an abrupt change in corrosion resistance, which could be attributed to UFG formation. A marked improvement is observed in FeCr alloys, where passivation becomes more protective owing to UFG formation induced by SPD. In severely deformed materials, structural alterations in dislocations and grain boundaries have a very high impact on the corrosion kinetics because of their closely spaced configuration.

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Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of Severely Deformed Pure and Single-Phase Materials

et al. 2019

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“…(iv) Surface roughness can also be improved. On the other hand, UNSM has influenced the corrosion properties as follows [27,28,29,30,31]: (i) Since the UNSM process strengthens the passive film, the pitting corrosion resistance of austenitic stainless steels can be enhanced. (ii) UNSM treatment of aged, austenitic stainless steel reduced chromium carbide and carbon segregation, hence improving the inter-granular corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Static Load in the UNSM Process on the Corrosion Properties of Alloy 600

Kim

2019

Materials

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To suppress stress corrosion-cracking, compressive residual stresses, such as shot peening, laser peening, water jet peening, ultrasonic peening, and ultrasonic nanocrystal surface modification (UNSM) are utilized. However, among the numerous techniques, there is little research about the corrosion effect of detailed conditions, such as static load or amplitude in UNSM. A study on UNSM among various techniques of adding compressive residual stress to Alloy 600 was conducted. The focus of this study was on the effect of the static load in UNSM on the corrosion properties of Alloy 600. Microstructure analysis was conducted using an optical microscope (OM), a scanning electron microscope (SEM), and electron backscattering diffraction (EBSD), while compressive residual stress was measured using a nano-indentation technique. A cyclic polarization test and the AC (Alternating Current)-impedance measurement were both used to analyze the corrosion properties. An increase in static load under critical static load enhanced the grain boundary diffusion, consequently strengthened the passive film, and facilitated the surface diffusion, thereby improving the passivation of Alloy 600. However, higher static loads over the critical value can lead to an increase in the friction between the striking tip and the surface, thereby creating an overlapped wave, which reduces the corrosion properties.

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“…Cr enrichment of passivation films in binary Fe-Cr alloys has often been attributed to the selective dissolution of Fe and the oxidation of Cr [41][42][43][44]. Higher corrosion resistance of UFG Fe-Cr alloys fabricated by SPD than that of CG alloys, which has been reported by many researchers [10,[14][15][16][17][18][19][20], is mostly attributed to greater Cr enrichment of the passivation film [19][20][21][22][23][24][25][26][27]. This local enrichment of Cr in the passivation film was mostly validated experimentally using XPS and established to date.…”

Section: Discussionmentioning

confidence: 99%

“…Among the various materials investigated to date, stainless steels exhibited mostly improved corrosion resistance by forming UFG structures by SPD [10,[14][15][16][17][18][19][20]. The enhanced corrosion resistance of UFG/NC SSs compared with coarse-grained (CG) materials has been mostly attributed to greater Cr enrichment in the passivation film [19][20][21][22][23][24][25][26][27], which has been validated experimentally by X-ray photoelectron spectroscopy (XPS) [24] and recently by Cs-corrected scanning-transmission electron microscopy (STEM) [28,29]. Two possibilities for the enhanced Cr enrichment in the passivation film of UFG/NC materials have been proposed.…”

Section: Introductionmentioning

confidence: 99%

“…Two possibilities for the enhanced Cr enrichment in the passivation film of UFG/NC materials have been proposed. One is the selective dissolution of Fe and oxidation of Cr due to the high chemical reactivity of the UFG structure [21,22], and the second is fast diffusion of Cr from the metal matrix to the passivation film through high-density grain boundaries in the UFG alloys [24][25][26][27]. In this context, Cr-containing HEAs, represented by equiatomic CoCrFeNiMn alloys, could be expected to exhibit higher corrosion resistance due to the UFG/NC structure.…”

Section: Introductionmentioning

confidence: 99%

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Corrosion Behavior of Ultrafine-Grained CoCrFeMnNi High-Entropy Alloys Fabricated by High-Pressure Torsion

2022

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The influence of the nanocrystalline structure produced by severe plastic deformation (SPD) on the corrosion behavior of CoCrFeMnNi alloys with Cr contents ranging from 0 to 20 at.% was investigated in aqueous 0.5 M H2SO4 and 3.5% NaCl solutions. The resistance to general corrosion and pitting became higher in both the solutions, with higher passivation capability observed with increasing Cr content, and it is believed that the high corrosion resistance of CoCrFeMnNi alloys can be attributed to the incorporation of the Cr element. However, the impact of the nanocrystalline structure produced by SPD on the corrosion behavior was negligibly small. This is inconsistent with reports on nanocrystalline binary Fe–Cr alloys and stainless steels processed by SPD, where grain refinement by SPD results in higher corrosion resistance. The small change in the corrosion behavior with respect to grain refinement is discussed, based on the passivation process of Fe–Cr alloys and on the influence of the core effects of HEAs on the passivation process.

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Enhanced Pitting Corrosion Resistance of 304 SS in 3.5 wt% NaCl by Ultrasonic Nanocrystal Surface Modification

Cited by 19 publications

References 65 publications

Corrosion Behavior of Severely Deformed Pure and Single-Phase Materials

Corrosion Behavior of Severely Deformed Pure and Single-Phase Materials

The Effect of the Static Load in the UNSM Process on the Corrosion Properties of Alloy 600

Corrosion Behavior of Ultrafine-Grained CoCrFeMnNi High-Entropy Alloys Fabricated by High-Pressure Torsion

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