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The Synergism Effect of Cerium Chloride and Nickel Sulphate on the Corrosion Resistance Behaviour of Zirconium Conversion Coating on Steel Substrate

Publish Year: 1395
Type: Journal paper
Language: English
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JR_ICAC-6-20_001

Index date: 25 November 2023

The Synergism Effect of Cerium Chloride and Nickel Sulphate on the Corrosion Resistance Behaviour of Zirconium Conversion Coating on Steel Substrate abstract

In this paper, the effect of cerium chloride with solution features of immersion time=15 minutes, concentration of cerium=5 gr/lit, pH =5.5 at room temprature  on the anti-corrosion behaviour of zirconium- coated steel in optimized condition with immersion time = 90 seconds,0.01 molar H2ZrF6 and pH= 4 was investigated.The results of EIS test showed that the corrosion resistance of steel without coating, with zirconium conversion coating and with zirconium-cerium conversion coating was 520, 1150 and 2400 Ω/cm 2 respectively. DC polarization test showed that the corrosion current density decreasd from 8.2 to 1.6 µA/cm2 .The addition of 200 ppm nickel sulphate to the cerium conversion solution increased the corrosion resistance of Zr-modified steel to 3300 Ω/cm 2 .

The Synergism Effect of Cerium Chloride and Nickel Sulphate on the Corrosion Resistance Behaviour of Zirconium Conversion Coating on Steel Substrate Keywords: