Effect of contact surface temperature on wear of nickel-chromium layer

2019 ◽  
Author(s):  
I. M. Widiyarta ◽  
I. M. Parwata ◽  
I. P. Lokantara ◽  
Dwipayana
Keyword(s):  
Surface Temperature ◽  
Contact Surface ◽  
Chromium Layer ◽  
Nickel Chromium

scholarly journals PENGARUH ENERGI AKTIVASI LOGAM PELAPIS TERHADAP KETEBALAN DAN LAJU KOROSI PLATING

2019 ◽  
Vol 3 (1) ◽  
Author(s):  
A. Noor Setyo HD ◽  
Sri Widodo
Keyword(s):  
Corrosion Rate ◽  
Optical Microscope ◽  
Current Strength ◽  
Nickel Layer ◽  
Chromium Layer ◽  
Chromium Plating ◽  
Nickel Chromium ◽  
Energy Gradient ◽  
Electrolyte Mixture ◽  
Electroplating Process

This study aims to study the effect of the activation energy gradient (∆G) of metals on the thickness and corrosion rate of Ni layers; Cr, and Ni-Cr. The layer is obtained through the Ni electroplating process; Cr, and Ni-Cr in carbon steel specimens using a variation of current strength of 1.25; 1.5 and 1.75 Ampere at constant stress and coating time (15 minutes). Nickel plating is obtained in the electric layer process using a watt's bath electrolyte solution in a mixture of 150 g / l NiSO4, 30 g / l NH4Cl, 30 g / l H3BO3 with a temperature of 25-35 oC, pH around 4-6, air agitation, Chromium plating using anode in the form of an alloy of Pb (lead) and Sn (antimony) rods, a solution in the form of an electrolyte mixture of 300 g / l CrO3, 3 g / l H2SO4 in working temperature of 40–55 oC, pH around 0.4 - 0.5 and air agitation. Corrosion thickness was observed using an optical microscope at 200 X magnification while the corrosion rate of observation was carried out based on the method of resistance polarization in the medium of 0.9% Sodium Chlorid Solution. The results showed that, in the same treatment, the thickness of the layer increased in increasing current strength, slower chromium than nickel layer and Nickel-Chromium layer. Sequential thickness of layers is obtained for Ni: 51, Cr: 39 layers, while corrosion rates occur at 1.75 A current in nickel layer 0.0017 mm / year; Chromium layer, 0.0077 mm /year and Nickel-Chromium layer 0.0231 mm / year

Contact Surface Temperature Models for Finite Bodies in Dry and Boundary Lubricated Sliding

1993 ◽  
Vol 115 (3) ◽  
pp. 411-418 ◽  
Author(s):  
Xuefeng Tian ◽  
Francis E. Kennedy
Keyword(s):  
Surface Temperature ◽  
Contact Surface ◽  
Temperature Rise ◽  
Large Scale ◽  
Finite Thickness ◽  
Sliding Contact ◽  
Small Scale ◽  
Heat Sources ◽  
Real Area Of Contact ◽  
Lubricated Sliding

A model is proposed for use in determining the contact surface temperature in dry and boundary lubricated sliding systems. The model uses the concepts of small scale and large scale heat flow restrictions to divide the temperature increase in a sliding contact into two contributions, a nominal surface temperature rise and a local temperature rise. The model is particularly useful in studying the sliding surface temperature in bodies of finite thickness and in cases when the sliding contact area repeatedly sweeps over the same path on one of the contacting solids. Multiple heat sources within the real area of contact can be included, as can the effects of a cooling and/or lubricating fluid. Experiments were carried out to measure the contact surface temperature rise in several dry and boundary lubricated sliding systems. The experimental results were found to agree with the model.

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