en گروه مکانیکی و شکل دادن Mechanical Performance and Formability of Materials Research Paper Research Paper Compression springs were prepared from Cr-Si high strength spring steel and coated with pure Zn and ZnNi by electroplating process. The effect of baking after electroplating as well as applying an electroless nickel interlayer on the fatigue and fatigue corrosion of the springs was investigated. The results were analyzed using weibull statistical model. A considerable improvement (8%) in fatigue life of the electroplated springs with Zn-Ni was observed in the presence of Ni interlayer. In addition, baking of these electroplated springs improved fatigue life by 4%. The fatigue life under salt spraying conditions, however, has demonstrated remarkable reduction by 40%, 34% and 30% for Zn-Ni plating, backed and unbaked Zn-Ni plating containing Ni interlayer, respectively Cr-Si spring steel, Zn-Ni alloy electroplating, Fatigue, Fatigue corrosion 27 37 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-127-92&slc_lang=en&sid=1 H. Nazemi hamidnazemy@yahoo.com 180031947532846003362 180031947532846003362 Yes Department of Materials Science and Engineering, Shahid Bahonar University of Kerman, Iran. M. Ehteshamzadeh 180031947532846003363 180031947532846003363 No Department of Materials Science and Engineering, Shahid Bahonar University of Kerman, Iran.