Effects of phosphoric acid based rust converter on stainless steels for anti-corrosion applications
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- Effects of phosphoric acid based rust converter on stainless steels for anti-corrosion applications
- Park, Jeong Seok
- Kim, Ji Hyun
- Issue Date
- Graduate School of UNIST
- The performance of rust converter based on the phosphoric acid was investigated on type stainless steel 304 and duplex stainless steel 2205 in terms of corrosion inhibition and scale removal effects.
The degree of corrosion inhibition was measured by potentiodynamic polarization and electrochemical impedance spectroscopy in a 3.5% NaCl solution. In order to make comparative study, inhibition efficiencies of as-received and pre-oxidized steels were measured in the presence and absence of rust converter. Additionally, electrochemical quartz crystal microbalance (EQCM) analysis was performed to monitor formation of rust conversion layer in real time. Surface analyses including EPMA and XPS were also carried out to establish the mechanism of corrosion inhibition.
For the formation of pre-oxidized layer, high temperature oxidation was treated at 500°C oxygenated atmosphere for 48hr. The nature and morphologies of oxide layers were characterized by SEM, XRD and XPS depth profiles.
From the electrochemical studies, inhibition effect of rust converter generally depends on the condition of specimens. Rust converter applied on as-received steels was observed to play a role of anodic type inhibitor. Cathodic type inhibition effect was observed in the pre-oxidized steels with effective scale removal effect.
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