Preparation and characterization of coatings on carbon steel obtained by PEO in silicate/carbonate electrolyte

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

“…Then, it was fast raised to the levels of Positive Voltage shown in Table 1. This operation is based on the literature 2 .…”

“…At present, there are three types of techniques to fabricate PEO coatings on the surface of carbon steel, including direct PEO, PEO on hot-dip aluminized carbon steel, and PEO after the deposition of Al 2 O 3 or SiO 2 layer on the surface of carbon steel 2 , 19 – 21 . Zhaohua Jiang et al mainly achieved four kinds of PEO coatings in different electrolytes.…”

“…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 .…”

“…At present, there are three types of techniques to fabricate PEO coatings on the surface of carbon steel, including direct PEO, PEO on hot-dip aluminized carbon steel, and PEO after the deposition of Al 2 O 3 or SiO 2 layer on the surface of carbon steel 2,[19][20][21] For ship LCS pipes, the ceramic coatings composed of iron oxide and aluminum oxide are not suitable for corrosion protection against acid environment. For example, it is necessary to have excellent acid corrosion resistance for the wastewater pipes of scrubbers on ships.…”