Characterisation and corrosion behaviour of WAP coating on 300M steel

In the present study, a grafted acrylic-epoxy polymer coating has been developed for cathodic electrodeposition. This is a mono-coat system where different colours (red, blue, black, grey, etc.) are developed in electrodeposition coatings. In this research, the mono-coat technology provides the dual coat (primer and overcoat). The mono-coat electrodeposition system has several advantages compared to conventional electrodeposition such as excellent durability, better UV resistance (500 h), lower cost in paint application and better metal protection against corrosion (500 h salt spray test as per ASTM B 117). The discussion would highlight the formulation concept and mechanism of electrodeposition coatings. The polymers of the grafted acrylic-epoxy system have been developed by varying the grafted acrylic/epoxy ratio. The grafted acrylic/epoxy composition of 80:20 has been found to have optimum anticorrosive and UV resistance properties.

Section: Resultsmentioning

confidence: 99%

“…(3) This relationship depends upon the existing paint film thickness and the properties of the paint [21][22][23].…”

Section: Controlling Applied Coating Thicknessmentioning

confidence: 99%

Acrylic-based monocoat eco-friendly, anticorrosive coating for cathodic electrodeposition

Prajapati

Kamani

2022

“…The constant phase element (CPE) was employed to characterize the capacitance behaviour due to the non-ideal state in electrochemical tests. The impedance of CPE can be expressed by the following equation [19,20]: where Y CPE is the magnitude of the CPE, j is the imaginary number ( j 2 =−1), ω is the angular frequency and n is the deviation parameter. The value of n can be used as a measure of the metal surface heterogeneity [21].…”

Section: Resultsmentioning

confidence: 99%

Section: Long-term Corrosion Behaviour Of the Coatingmentioning

confidence: 99%

Corrosion behaviours of arc-sprayed AlSi-based amorphous/nanocrystalline coating

Liu

Cheng

Zhang

et al. 2020

The aim of this article is to investigate the corrosion behaviours of arc-sprayed AlSiFeNiRE amorphous/nanocrystalline coating under different solution temperatures and different solution flow velocities. All tests were measured by CHI660E electrochemical workstation. The microstructure of the coating was characterized by scanning electron microscope (SEM) and the phase structure of the coating was examined using an X-ray diffraction (XRD) appliance. The morphologies and compositions of the coatings after immersion were analysed by SEM equipped with energy-dispersive spectrometer (EDS). The results show that the corrosion resistance of the coating increases first and then decreases with the prolonging of immersion time in long-term immersion. When the immersion reaches 10 days, the coating displays the lowest corrosion rate. With increasing solution temperature, the corrosion resistance of the coating decreases at first and then increases. The corrosion resistance of the coating decreases gradually as a function of the flow velocity.

“…The electrochemical tests were conducted using the Autolab PGSTAT 302N device which was controlled by NOVA 2.1.3 computer program. Also, a traditional 3-electrode cell was utilized in the electrochemical examinations as described elsewhere [37]. It is necessary to isolate the working electrode in the electrochemical test solution since the polarization current is directly dependent on the surface area.…”

Section: Corrosion Examinationsmentioning

confidence: 99%

Electroless Ni–B–MMT nanocomposite on magnesium alloy

Miri

Seifzadeh

Rajabalizadeh

2021

Ni-B and Montmorillonite (MMT)-containing Ni-B deposits were electrolessly plated on AM60B magnesium alloy. The Ni-B coating showed cauliflower-like micromorphology, microcrystalline-amorphous microstructure, and thickness of about 15 μm, which was not influenced by the inclusion of MMT nanoparticles. The surface roughness of the Ni-B coating changed from about 376 to 328 nm after the inclusion of MMT. The boron content of the electroless deposit was mildly increased after MMT inclusion. Thermal shock and porosity examinations revealed suitable adhesion and pore-free structure of the coatings, respectively. Polarization resistance of the Ni-B deposit in 3.5 wt-% sodium chloride was increased about 1.5 times by MMT inclusion. The corrosion current of the substrate was remarkably diminished from 46.89 to 0.12 µA cm −2 by the Ni-B plating. Also, MMT incorporation causes to further decrement of the corrosion current to about 0.03 µA cm −2 .