Characterization of plasma electrolytic oxidation coating on low carbon steel prepared from silicate electrolyte with Al nanoparticles

The Influence of Negative Voltage on Corrosion Behavior of Ceramic Coatings Prepared by MAO Treatment on Steel

“…The surface porosity of the coating by the statistics of ImageJ software is also shown in Figure 2f. The sample surface under each negative voltage has the volcanic hole characteristic [32]. The papillary-like morphology (point A in Figure 2a) observed in the high-magnification image is the main surface feature in the F1 and F2 coatings, and the formation process of this type of morphology is known as an A-type discharge event [33,34].…”

“…Meanwhile, negative voltage has been found to influence the content of coating composition, especially that of α-Al 2 O 3 . The amount of α-Al 2 O 3 generated on the coating surface is increased, which is favorable to enhance the corrosion resistance of alloy substrate [32]. The instantaneous temperature generated by a negative voltage is a crucial factor for the crystal transition of Al 2 O 3 (Equation ( 13)) [33] and the reduction of coating cracks and holes through the melting and solidification process.…”

Anticorrosive non-crystalline coating prepared by plasma electrolytic oxidation for ship low carbon steel pipes

“…The four types of ceramic coatings are Fe 3 O 4 , amorphous coating, Fe 3 O 4 and FeAl 2 O 4 , and FeAl 2 O 4 , Fe 3 O 4 , and a little γ-Al 2 O 3 22 – 27 . Jun Liang et al prepared a ceramic coating composed of SiO 2 , Fe 2 O 3 , Fe 3 O 4 in silicate electrolyte with the additive of Al nanoparticles, the corrosion resistance of the coating was improved significantly 1 . Malinovschi et al obtained an amorphous SiO 2 coating on the surface of S234JR steel in sodium silicate/carbonate electrolyte; the coating has a certain corrosion resistance 2 .…”

“…Low carbon steel (LCS) is one of the most widely employed metal materials in the shipping industry due to good plasticity and ductility, and low cost 1,2 . For instance, the majority of ship pipeline is fabricated by LCS 3 .…”

“…The plasma electrolytic oxidation (PEO) is one of the most promising techniques to fabricate anticorrosive coating for the LCS pipeline 1 . The PEO is widely used to fabricate functional coatings on light metals and their alloys, such as Al, Mg, and Ti [9][10][11][12][13][14][15][16] .…”