Pitting Kinetics of 304 Stainless Steel Using ESPI Detection Technique

Abstract

The electronic speckle pattern interferometer was used to in situ monitor the pitting corrosion of 304 stainless steel at anodic polarization. The pitting current and pitting current density of a single pit were obtained. The pit growth was controlled by the corrosion products diffusion. The pit morphology was observed by a scanning electron microscope. The results showed that the pit was dish shaped, and the geometric parameters and pit growth time conformed to the function of Y = A ? B 1 t ? B 2 t 2 ? B 3 t 3 .

Microstructure and High-Temperature Oxidation Behavior of Dy-Doped Nb–Si-Based Alloys

“…The improvement in the cyclic oxidation resistance of NiAl-30.9Cr-3Mo-0.1Dy alloy is due to the formation of continuous and compact Al 2 O 3 external layer [20]. Besides, as reported by Tian et al [21], the addition of Dy enhances the room-temperature and high-temperature compressive strength and room-temperature compressive ductility of Nb-Si-based alloys. However, the effect of Dy on the oxidation behavior of Nb-Si-based alloys has not been systematically explored.…”

“…It is observed that Dy is mainly partitioned in silicides, especially in cNb 5 Si 3 . Tian et al [21] reported that the Dy addition remarkably refined the size of (Nb,Ti) 5 Si 3 phase in Nb-23Ti-10Ta-2Cr-18Si alloy (at.%), as rare earth element of Dy had a high surface activity and tended to reduce the surface tension of liquid Nb-Si melt as well as the nucleation energy during solidification. However, for the Nb-15Si-24Ti-4Cr-2Al-2Hf alloy, the Dy addition produces no obvious effect on the microstructure fineness.…”

Effect of the microstructure on the corrosion behavior of dissimilar friction stir-welded 304 austenitic stainless steel and Q235 low-carbon steel joints

“…However, metal ions diffused rapidly through the new corroded pores, which again decreased the local concentration of the salt solution and induced passivation at the edges. Therefore, during the film destruction and passivation at the pit edges, the pits continued to grow, causing the film to be destroyed repeatedly before finally forming corrosion pits with porous lacy covers [40][41][42][43].…”

Determination of Iron Valence States Around Pits and the Influence of Fe3+ on the Pitting Corrosion of 304 Stainless Steel

“…It is known that some corrosion products diffuse to the outside of pits during the growth of corrosion pits [10,11]. The hydrolysis of cations changes the corrosive environment of the passive film outside the pits [12].…”