Localized Corrosion of Nanocrystalline 304 Type Stainless Steel Films

Abstract

Nanocrystalline (grain size approximately 25 nm) stainless steel films were prepared by sputter-depositing the conventional 304 type stainless steel on glass substrates. Despite the same chemical composition, the breakdown potential (E b ) of the sputtered stainless steel films is found to be approximately 850 mV higher than that of the conventional material. Also, the breakdown potentials of the sputtered nanocrystalline stainless steel films are close to those of the amorphous FeCr 18 Ni 9 W 11 and FeCr 10 P 13 C 7 alloys reported in the literature. The high corrosion resistance of the sputtered films is attributed to the smaller grain size of the films.

Role of Nanostructure in Electrochemical Corrosion and High Temperature Oxidation: A Review

“…In another study, a nanocrystalline coating of 304-stainless steel (25 nm grain size) is reported to show superior corrosion resistance to the bulk microcrystalline alloy of same composition in chloride containing acidic medium. [99] The coating not only exhibited a wider passivation region but also showed no evidence of pitting. In contrast, the bulk steel suffered extensive pitting corrosion.…”

“…[99][100][101][102][103][104][105] Exploitation of nanocrystalline structure has recently been investigated for an improvement in both electrochemical corrosion as well as high temperature oxidation of various alloys. Recent studies have shown that the effect of reducing the grain size to nanocrystalline regime can significantly improve the high temperature oxidation resistance of Fe-based alloys due to the enhanced diffusion of beneficial alloying elements to the alloy surface facilitating the formation of a protective oxide layer.…”

Characterization of the passive films on electrodeposited Fe-Ni-Cr alloys in borate solution at pH 8.4

“…However, higher passive current densities have been recorded for nanocrystalline materials, [8,9] and this has been attributed by the researchers to either the passive film being more defective or thinner compared to films formed on polycrystalline materials. The authors also noted that enhanced stability of the passive layer against local corrosion has been reported by other researchers for nanocrystalline Fe-Ni-Cr alloys [10,11].…”

“…Further investigation may reveal whether the ability of the electrodeposited Fe-Ni-Cr alloy offers protection against non-uniform pitting corrosion as has been observed for other amorphous/microcrystalline materials recorded in the literature [8,11]. In the literature, research illustrates the structure-property relationship of electrodeposited iron based alloys of various compositions produced with different deposition variables [35,36].…”

Recubrimientos micro/nanoestructurados de aleaciones ligeras mediante proyección fría para la protección y reparación de componentes de elevado valor añadido: Estado del arte

“…Gracias a las múltiples investigaciones desarrolladas en los últimos años [37][38][39][40][41][42][43] que ponen en evidencia la superioridad de las propiedades de los materiales en escala nanométrica y nanoestructurados con respecto a sus homólogos en escala micrométrica, no han tardado en surgir estudios para lograr obtener recubrimientos nanoestructurados por proyección fría. Los materiales nano-estructurados exhiben una mayor resistencia mecánica, una alta tenacidad y mejores propiedades frente a la fatiga; asimismo, pueden comportarse súper-plásticamente a temperaturas relativamente bajas (< 0,5 Tm) y altas velocidades de deformación.…”