Abstract
In this study, cerium-based conversion coating was deposited on steel X52 by dip immersion method. Cerium oxide/hydroxide is an environmentally friendly conversion coating. The effects of immersion times and immersion temperatures on corrosion properties of cerium conversion coating on steel X52 were studied. Its corrosion resistance in 3.5 wt.% NaCl solution was investigated by means of electrochemical impedance spectroscopy, potentiodynamic polarization, and surface techniques. The coated samples showed a significant decrease in corrosion rate and corrosion current decreased with increasing immersion time up to 60 s. In addition, electrochemical impedance data showed that in the presence of cerium oxide conversion coatings, the charge transfer resistance of aluminum increased. The experimental results indicated that the corrosion resistance decreased with increasing the operating temperature. Surface morphology and its chemical composition were analyzed by means of scanning electron microscopy and energy dispersive spectroscopy.
Highlights
Steel is the most frequently used metal in various industries due to its good mechanical properties
Conversion coatings are used in metal finishing to afford corrosion protection and to improve the adhesion of paint systems to the underlying metal[13,14]
The electrochemical behavior of the cerium oxide coatings after different immersion times was studied by potentiodynamic polarization in 3.5 wt% NaCl solution
Summary
Steel is the most frequently used metal in various industries due to its good mechanical properties. Despite relatively limited corrosion resistance, steel is used in large tonnages in marine applications, chemical processing, petroleum production and refining, construction and metal processing equipment[1,2]. Surface treatment is an effective technique to solve the problem, which includes chemical conversion coating, electroplating and electroless plating, physical vapor deposition and so on[10,11,12]. Among these surface treatments, chemical conversion treatment is a simple and cost effective method and has been increasingly used in a wide range of applications. The conversion coating acts as a physical barrier to protect the metal from corrosive environment. The local cracking of the conversion coatings decreases the corrosion resistance
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