Volume 6, Issue 20 (6-2016)
مهندسی خوردگی 2016, 6(20): 7-20 |
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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. مهندسی خوردگی 2016; 6 (20) :7-20
URL: http://journal.ica.ir/article-1-141-en.html
URL: http://journal.ica.ir/article-1-141-en.html
Abstract: (241 Views)
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 .
Keywords: Corrosion, Conversion coating, Hexaflourozirconic acid, Cerium, Electrochemical impedance spectroscopy, Direct current polarization
Type of Study: Research |
Subject:
General
Received: 2022/11/25 | Accepted: 2016/06/30 | Published: 2016/06/30
Received: 2022/11/25 | Accepted: 2016/06/30 | Published: 2016/06/30
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