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Paper Information

Journal:   INTERNATIONAL JOURNAL OF INDUSTRIAL ENGINEERING AND PRODUCTION MANAGEMENT (IJIE) (INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE) (PERSIAN)   FALL 2006 , Volume 17 , Number 3; Page(s) 111 To 121.
 
Paper: 

THE EFFECT OF SUBSTRATE SURFACE ROUGHNESS ON THE TRIBILOGICAL BEHAVIOUR OF HARD CHROMIUM COATING

 
 
Author(s):  SALEHI ALI REZA, ZAGHAR A., SHAHRABI FARAAHANI T.*
 
* DEPARTMENT OF MATERIALS ENGINEERING, FACULTY OF ENGINEERING TARBIAT MODARRES UNIV., TEHRAN, IRAN
 
Abstract: 

In this research, the effect of substrate surface roughness on the tribological behaviour of hard chromium coatings deposited on heat-treated steel substrate (DIN 1.6959) has been investigated. The coatings were plated on substrates with surface roughness of Ra=0.01, 0.03, 0.05, 0.3 and 2.2mm produced by mechanical method and Ra=0.07 and 0.14  mm produced by electropolishing. The wear and frictional behaviour of the coatings were investigated by a ball-ondisk test machine in dry sliding condition through the use of ruby ball under different loads. The results indicated that the surface roughness and hardness of the coatings were affected by their own substrate surface roughness. The results of wear experiments under a load of 2 kgf showed that the coating with substrate surface roughness of Ra=0.05 mm had the lowest hardness and the highest wear rate. For coatings plated on substrates with- surface roughness of above and below this value the hardness and wear resistance increased. The best wear resistance was obtained by the coating with substrate surface roughness of Ra=0.07mm produced by electropolishing with pulse current. In this case, the dominant wear mechanism in short sliding distance is abrasion and in long sliding distance is spalling of the coating (i.e. fatigue mechanism).

 
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