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51318-11633- Bio-Inspired PBAT/LDH Coatings for Corrosion Protection

Picture for 51318-11633- Bio-Inspired PBAT/LDH Coatings for Corrosion Protection
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The corrosion properties of polybutyrate-adipate terephthalate , layered double hydroxides (PBAT/LDH) coating on mild steel substrate was investigated.

Product Number: 51318-11633-SG
Author: Kayode Oluwabunmi / Hussain Rizvi / Nandika D’Souza / Seifollah Nazrazadani / Steve Sanders / Vahid Hemmati / Gaurav Argade
Publication Date: 2018
Industry: Science of Corrosion
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The corrosion properties of PBAT/LDH coating on mild steel substrate was investigated. Tafel tests and electrochemical impedance spectroscopy tests (EIS) was used to analyze the corrosion resistance of the coating on the mild steel substrates. The morphological characteristics of the coatings was done using the scanning vibrating electrode technique (SVET) and environmental scanning electron microscopy (ESEM). Buffered saline solution containing NaCl-0.138 M, KCl-0.0027 M at room temperature and pH of 7.4 was used as electrolyte in the 3 corrosion tests. The tafel results showed that least corrosion current density value of 0.315 (μA/cm2) was recorded for 50 % LDH concentration in PBAT. This suggests that 50 % LDH in PBAT was about 98.5 % more corrosion efficient than 1018 bare mild steel and 0.7 % more that the 65 % concentration. The EIS results showed a similar trend. The 65 % LDH concentration showed about 25 % greater impedance to current flow over the 50 % LDH concentration in both the nyquist and bode plots. The SVET results revealed that the greatest corrosion protection of the mild steel substrates was observed with 50 % and 65 % LDH coating. This proved that an increased concentration of LDH in PBAT could potentially improve the corrosion resistance of mild steel when in service in a phosphate buffered saline environment.

Key words: Polybutyrate- adipate terephthalate (PBAT), layered double hydroxides (LDH), scanning vibrating electrode technique (SVET), tafel plots, electrochemical impedance spectroscopy (EIS), corrosion.

The corrosion properties of PBAT/LDH coating on mild steel substrate was investigated. Tafel tests and electrochemical impedance spectroscopy tests (EIS) was used to analyze the corrosion resistance of the coating on the mild steel substrates. The morphological characteristics of the coatings was done using the scanning vibrating electrode technique (SVET) and environmental scanning electron microscopy (ESEM). Buffered saline solution containing NaCl-0.138 M, KCl-0.0027 M at room temperature and pH of 7.4 was used as electrolyte in the 3 corrosion tests. The tafel results showed that least corrosion current density value of 0.315 (μA/cm2) was recorded for 50 % LDH concentration in PBAT. This suggests that 50 % LDH in PBAT was about 98.5 % more corrosion efficient than 1018 bare mild steel and 0.7 % more that the 65 % concentration. The EIS results showed a similar trend. The 65 % LDH concentration showed about 25 % greater impedance to current flow over the 50 % LDH concentration in both the nyquist and bode plots. The SVET results revealed that the greatest corrosion protection of the mild steel substrates was observed with 50 % and 65 % LDH coating. This proved that an increased concentration of LDH in PBAT could potentially improve the corrosion resistance of mild steel when in service in a phosphate buffered saline environment.

Key words: Polybutyrate- adipate terephthalate (PBAT), layered double hydroxides (LDH), scanning vibrating electrode technique (SVET), tafel plots, electrochemical impedance spectroscopy (EIS), corrosion.

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