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Laser Surface Alloying of Aluminum for Improving Acid Corrosion Resistance

  • Woldetinsay Gutu Jiru
  • Mamilla Ravi Sankar
  • Uday Shanker Dixit
Original Contribution

Abstract

In the present study, laser surface alloying of aluminum with magnesium, manganese, titanium and zinc, respectively, was carried out to improve acid corrosion resistance. Laser surface alloying was conducted using 1600 and 1800 W power source using CO2 laser. Acid corrosion resistance was tested by dipping the samples in a solution of 2.5% H2SO4 for 200 h. The weight loss due to acid corrosion was reduced by 55% for AlTi, 41% for AlMg alloy, 36% for AlZn and 22% for AlMn alloy. Laser surface alloyed samples offered greater corrosion resistance than the aluminum substrate. It was observed that localized pitting corrosion was the major factor to damage the surface when exposed for a long time. The hardness after laser surface alloying was increased by a factor of 8.7, 3.4, 2.7 and 2 by alloying with Mn, Mg, Ti and Zn, respectively. After corrosion test, hardness was reduced by 51% for AlTi sample, 40% for AlMg sample, 41.4% for AlMn sample and 33% for AlZn sample.

Keywords

Pitting corrosion Laser surface alloying Aluminum Magnesium Manganese Titanium Zinc 

Notes

Acknowledgement

This paper is a revised and enhanced version of the paper entitled ‘Improving acid corrosion resistance of pure aluminium by laser surface alloying with Mg and Mn’ presented at the Fourth International Conference on Production and Industrial Engineering (CPIE2016) held at Dr. B.R. Ambedkar National Institute of Technology, Jalandhar during 19–21, December 2016. Authors thank the organizers of the Conference. The authors are also grateful for the financial support provided by Indian Institute of Technology Guwahati (SG/ME/P/MRS/01), Board of Research in Nuclear Sciences (ME/P/MRS/02), Department of Electronics & Information Technology (Grant No. 5(9)/2012-NANO), and Department of Science and Technology for ‘Technology Systems Development Programme (DST/TSG/AMT/2015/619)’.

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Copyright information

© The Institution of Engineers (India) 2018

Authors and Affiliations

  • Woldetinsay Gutu Jiru
    • 1
  • Mamilla Ravi Sankar
    • 1
  • Uday Shanker Dixit
    • 1
  1. 1.Department of Mechanical EngineeringIndian Institute of Technology GuwahatiGuwahatiIndia

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