Laser surface coating of titanium on carbon steel plate and its corrosion resistance.

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Laser surface coating of titanium was investigated to improve the corrosion resistance of carbon steel plate.Titanium powder was pre-coated to carbon steel plates using organic flux and surface meltings were carried out for the coated surface with a CO2 laser beam of 3kw input power under the atmospher of argon. And to study the nature of laser surface coating layer, metallurgical examinations, X- ray analysis and corrosion tests were conducted for the coated plates.The obtained results were as follows.(1) This laser surface coating technique produced defect-free Ti coating layer with the thickness of maximum 0.5mm.(2) The Ti-coated steel exhibited the almost same resistance to corrosion as that of commercial purity titanium in the electrochemical crevice corrosion and pitting corrosion tests in which 3% NaCl solution were used.(3) The Ti-coated steel indicated lower weight loss than commercial type 316L steel in the corrosion/erosion test in which test specimens were rotated in the 3% NaC solution containing Al2O3 particles.
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