Abstract
A single electrodeposited film of 6-(3-triethoxysilylpropyl)amino-1,3,5-triazine-2,4-dithiol monosodium (TES) on a copper alloy surface was prepared by the galvanostatic method, then octyl-triethoxysilane (OTES) or hexadecyl-trimethoxysilane (HDTMS) was used to modify the electrodeposited film by the self-assembled technique to fabricate the complex film. The electrodeposition process was inferred by cyclic voltammetry. The single and complex films were characterized by means of contact angle, cyclic voltammetry, Fourier transform infrared spectroscopy (FT-IR), potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and scanning electron microscope (SEM). The results showed that the contact angle of the complex film covering the copper alloy surface was up to 118.1° compared with 89.4° of the bare copper alloy. The cyclic voltammogram, polarization curves and EIS indicated that the anti-corrosion performance of complex film was better than that of single electrodeposited TES film, and the protection efficiency was up to 90.2%.
Highlights
Copper and its alloys are extensively used in industry areas because of their high electrical and thermal conductivities, mechanical workability and inactive properties [1]
The characteristics of single and complex films on copper alloy are analyzed by means of Fourier transform infrared spectroscopy (FT-IR), contact angle, scanning electron microscope (SEM), cyclic voltammetry, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS)
Complex film-modified electrode, indicating that had not appeared on the TES/hexadecyl-trimethoxy silane (HDTMS) complex film‐modified electrode, indicating that the complex the complex film protected the substrate from pit corrosion
Summary
Copper and its alloys are extensively used in industry areas because of their high electrical and thermal conductivities, mechanical workability and inactive properties [1]. The most extensive study is choosing proper organic compounds as corrosion inhibitors, such as azoles [4], amines [5] and amino acids [6]. Some organic compounds, which contain functional electronegative groups and π-electrons in triple or conjugated double bonds, play an important role in the corrosion inhibition process [12]. These hetero-atoms, such as sulfur, phosphorus, nitrogen, and oxygen, together with heterocyclic or conjugated aromatics, are known to be an excellent complex with metals or chelate with metals of the transition series. Self-designed and synthesized triazinedithiolsilane is used to prepare the novel heterocyclic silane electrodeposited film of 6-(3-triethoxysilyl-propyl)amino-1,3,5-triazine-2,4-dithiol monosodium (TES) on a copper alloy surface. The characteristics of single and complex films on copper alloy are analyzed by means of Fourier transform infrared spectroscopy (FT-IR), contact angle, scanning electron microscope (SEM), cyclic voltammetry, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS)
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