Sami I.J.  Alrubaiey, Hussein S.A.  Fakhar, 
    Improvement Corrosion Resistance of Carbon Steel by Laser Surface
Alloying within Nickel and Chromium Powders,
    Journal of Engineering and Applied Sciences,
    Volume 13,Issue 3,
    2018,
    Pages 734-738,
    ISSN 1816-949x,
    jeasci.2018.734.738,
    (https://makhillpublications.co/view-article.php?doi=jeasci.2018.734.738)
    Abstract: Low carbon steel ST-37 had poor corrosion resistance in several environment. Therefore, Laser
Surface Alloying (LSA) is done by using Ni and Cr powders. LSA is perform in two steps. The first, powder is
stick on the surface by preplace method. The second step is laser processing to melt both powder and base
metal to form an alloy on the surface. Solid state Nd:YAG laser pulse mode within specify laser parameter is
used. Microstructure, surface alloy composition, corrosion behavior and regions depth after laser processing
are study. Energy Dispersive Spectroscopy (EDS) optical microscope and potentialstate polarization technique
are used in this study. Corrosion test is perfrom in 3.5% NaCl solution. Different corrosion parameters are
studied (i<sub>corr.</sub>, E<sub>corr.</sub>, i<sub>passive</sub>, E<sub>passive</sub>, i<sub>transpassive</sub>, E<sub>transpassive</sub> ). The aim of this research is to investigate the effect of laser      
alloy surface layer within different composition on corrosion behavior of steel. Different surface layer
composition of Fe-Ni and Fe-Cr alloys are formed. The results show improving in corrosion resistance of steel
due to form passive layer when the surface is alloying with Ni or Cr powders. The depth of melted and heat
affected zones within Cr-powder is clearly more than Ni-powder samples.
    Keywords: Corrosion;steel;laser surface alloying;passivation;parameters;composition