Corrosion properties of a complex multi‐phase martensitic stainless steel depending on the tempering temperature

The protectiveness and characterization of the passive film formed on Z3CN20.09M duplex stainless steel aged for different times were investigated by using electrochemical measurements and surface analysis method. The thermal aging causes the spinodal decomposition of the ferrite phase in the steel, resulting in the decrease of localized corrosion resistance. The increased aging time causes a thicker, dispersive, and lower resistance passive film formed on the surface of the steel based on EIS and Mott–Schottky (MS) analysis. The Auger electron spectroscopy (AES) and X‐ray photoelectron spectroscopy (XPS) results indicate that Cr is enriched in the inner layer of the passive films with a reduced content, decreasing the compactness and homogeneity of the passive films.

Section: Resultsmentioning

confidence: 97%

“…The rapid increase of current density indicates the occurrence of stable pitting. [35] Moreover, some spikes can also be observed. These spikes represent the metastable pitting.…”

Section: Potentiodynamic Polarization Behavior Analysismentioning

confidence: 97%

Passive film properties of Z3CN20.09M duplex stainless steel aged for different times

You

Chen

Yang

2018

“…Because of optimum combination of strength, hardness, wear and corrosion resistance, martensitic stainless steel are used in a wide variety of engineering applications such as marine turbine blades, water valves, pumps, shafting, and offshore platforms for oil extraction, etc., where mechanical wear and electrochemical corrosion often co‐exist. Martensitic stainless steel possesses fine corrosion resistance derived from the passive oxide film on the surface with a thickness of 1–10 nm . However, the protective passive film can be easily destroyed or even completely removed by mechanical wear, leading to accelerated corrosion, which results in accelerated wear in turn.…”

Section: Introductionmentioning

confidence: 99%

Tribocorrosion behavior of 410SS in artificial seawater: effect of applied potential

Zhang

Wang

Zhang

et al. 2016

In this work, a series of experiments were conducted to evaluate the effect of applied potential on the tribocorrosion behavior of 410SS using a tribometer integrated with an electrochemical workstation. Results show that tribocorrosion rate of 410SS varies with applied potential and reaches a maximum at À0.1 V. By applying potential pulse method, it indicates that the repassivation kinetics of 410SS is much slower than general stainless steels.The XPS results reveal great changes in the composition of tribocorrosion products, which are enriched in Fe 3 O 4 and Fe(OH) 2 in the lower potential range while become Fe 2 O 3 , FeOOH, and Fe(OH) 3 at more positive potential. The characteristics of tribocorrosion products depend on surface chemistry which varies in compliance with applied potential, and thus, alters the tribocorrosion rate of 410SS. Moreover, the synergistic effect between wear and corrosion was quantified, showing that pure mechanical wear and corrosion-induced wear were the main reasons for the degradation of 410SS.

“…Closed and open pits were observed on the corroded steel samples with pitting potentials measured as 150 mV/SCE in 1 wt% NaCl solution and 49.5 mV/SCE in 3 wt% NaCl solution at a temperature of 50°C. Seifert et al [11] explored the corrosion performance of HIP-produced, multiphase martensitic X190CrVMo20-4-1 stainless steel specimens heat-treated at different conditions in NaCl electrolytes. The steel exhibited the best corrosion resistance when tempered at low temperatures between 100°C and 200°C.…”

mentioning

confidence: 99%

Influence of nitrogen uptake and heat treatment on the microstructural characteristics and corrosion performance of X190CrVMo20‐4‐1 steel produced by supersolidus liquid‐phase sintering

Farayibi

Hassend

Blüm

et al. 2021

Martensitic stainless steel powder exhibits a high nitrogen uptake when densified by supersolidus liquid-phase sintering in a nitrogen atmosphere, but the optimum uptake, which is beneficial to its resistance to corrosion, is unknown. In this study, the resistance of high-carbon martensitic stainless steel X190CrVMo20-4-1 densified in a nitrogen atmosphere against pitting corrosion was explored. This was to clarify the impact of nitrogen uptake in the steel matrix in the quenched and tempered condition on its corrosion resistance in an aqueous solution. Samples were subjected to potentiodynamic polarisation tests in a de-aerated, 1 wt% NaCl solution. Results revealed that the X190 steel densified in a nitrogen atmosphere at 40-kPa pressure, subjected to deep cryogenic treatment in liquid nitrogen at an austenitising temperature of 1150°C and tempered at 200°C, had the best pitting corrosion resistance with a breakdown potential of 142 ± 11 mV/SCE and a hardness of 738 ± 4 HV10. The matrix around the M 7 C 3 carbides and MX carbonitrides suffered high pitting susceptibility. The implications of this study serve as a basis for the improvement of the functional properties of steels.