Morphological Changes During Annealing of Electrodeposited Ni-Cr Coating on Steel and Their Effect on Corrosion in 3% of NaCl Solution |
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Authors: | Manpreet Singh Marwah Vajjala Srinivas Ajoy Kumar Pandey Shyam Ranjan Kumar Koushik Biswas Joydeep Maity |
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Affiliation: | 1. Material Engineering Division (Q uality Assurance), Tata Motors Limited, Jamshedpur 831004, Jharkhand, India 2. Materials Engineering Department, Ashok Leyland Technical Center, Vellivayalchavadi 600103, Chennai, India 3. Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur 721302,West Bengal, India 4. Department of Applied Science, National Institute of Foundry and Forge Technology,Ranchi 834003, West Bengal, India 5. Department of Metallurgical and Materials Engineering, National Institute of Technology, Durgapur 713209, West Bengal, India |
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Abstract: | Steel containing carbon of 0.2% was coated with Ni and Cr through electrodeposition, and subsequently annealed at 400 and 600 ℃ for 5 min, 30 min, 1 h and 2 h. During annealing at 400 ℃, the formation and growth of oxides occurred in the form of petals along with voids, cracks and porosities. However, at 600 ℃, the nucleation and growth of chromium oxide whiskers produced a surface almost free from crack, porosity and void for 1 h and 2 h of holding. In accordance with the surface morphology, the bare steel, as-deposited steel, all specimens deposited and annealed at 400 ℃ , and specimens deposited and annealed at 600 ℃ for 5 and 30 min exhibited continuous corrosion in 3% of NaCl solution. However, the specimens deposited and annealed at 600 ℃ for 1 and 2 h exhibited an improved corrosion resistance in 3% of NaCl solution with high pitting potential due to presence of a dense passive oxide film almost free from voids at the surface. |
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Keywords: | steel electrodeposition annealing corrosion resistance |
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