Enhancing the Stability of Passive Film on 304 SS by Chemical Modification in Alkaline Phosphate–Molybdate Solutions

Abstract

The purpose of this work was to enhance the corrosion resistance of the passive film on 304 stainless steel (SS) by chemical modification in alkaline phosphate-molybdate solutions. The 304 SS was passivated in both phosphate and phosphate-molybdate mixed solutions to investigate the effect of molybdate on its corrosion resistance. The experimental results indicated that the passive film showed better corrosion resistance in Cl −-containing solutions after modification in phosphate-molybdate solutions than in phosphate-only solutions. Energy-dispersive spectroscopy analyses revealed that the passive film formed in phosphate-molybdate solutions contained Mo and P after modification, which is the reason for the enhanced corrosion resistance.

Design of Porous Core–Shell Manganese Oxides to Boost Electrocatalytic Dinitrogen Reduction

“…The as-synthesized MnO x catalysts were evaluated for NRR in 0.1 M Na 2 SO 4 solution under room temperature and atmospheric pressure using a two-compartment electrochemical cell, which was separated by a proton-exchange membrane. Neutral electrolytes were applied to avoid the corrosion problems that occur in acidic and alkaline solutions . Before electrochemical tests, the N 2 feed gas was pretreated to remove possible NH 3 , labile nitric oxides, nitrates, and nitrites.…”

“…Neutral electrolytes were applied to avoid the corrosion problems that occur in acidic and alkaline solutions. 24 Before electrochemical tests, the N 2 feed gas was pretreated to remove possible NH 3 , labile nitric oxides, nitrates, and nitrites. It was ensured that negligible amounts of NO 3 − and NO 2 − were present in the N 2 -saturated solutions (Figures S3 and S4).…”

Characterization of Anodic Films Produced on Anodized AA1050 Aluminum Alloy: Effect of Bio-additive

“…Such observation has also been reported in case of the chemically modified stainless steel. [57] Fig . 8-The variation in coefficient of friction with sliding distance attributed to the wear tests of (a) bare Al, and samples that were anodized in 5 vol pct H 2 SO 4 baths including (b) 0 g/L, (c) 2 g/L, (d) 5 g/L, and (e) 10 g/L eggshell particles.…”

Imidazo [1,2-a] Pyrimidine Derivatives as Effective Inhibitor of Mild Steel Corrosion in HCl Solution: Experimental and Theoretical Studies

“…The shape of impedance spectra obtained in different electrolyte solutions (containing different concentrations of corrosion inhibitor and blank) are the same, which suggests that the corrosion mechanism of mild steel has not changed, and the radius of capacitive loops increases significantly after increasing the corrosion inhibitor concentration. The behavior of the impedance can be illustrated by adapting an electrochemical equivalent circuit (Figure 3) including a solution resistance (R s ), constant phase element (CPE), and the charge transfer resistance (R ct ) (Pan et al, 2020). The electrochemical parameters are listed in Table 3.…”