Improvement of Surface Characteristics by Electroplating Hard Chromium Coating Post Treated by Nanocrystalline Plasma Electrolytic Carbonitriding

2009 ◽  
Vol 6 (S1) ◽  
pp. S297-S301 ◽  
Author(s):  
Seyed Haman Hedayat Mofidi ◽  
Mahmood Aliofkhazraei ◽  
Alireza Sabour Rouhaghdam ◽  
Ehsan Ghobadi ◽  
Ehsan Mohsenian
Keyword(s):  
Surface Characteristics ◽  
Chromium Coating ◽  
Hard Chromium ◽  
Plasma Electrolytic

Effect of PEG addition and temperature on hard chromium coating using eco-friendly trivalent chromium

2020 ◽  
Author(s):  
Aditianto Ramelan ◽  
Akmal Fauzi ◽  
Riska Rachmantyo ◽  
Firmansyah Sasmita ◽  
Lidya ◽  
...  
Keyword(s):  
Trivalent Chromium ◽  
Chromium Coating ◽  
Hard Chromium

Aspects of Applying Hard Chromium Coatings on the Inner Surfaces of Components for Hydraulic Drives with Hydrostatic Guideways

2021 ◽  
Vol 316 ◽  
pp. 827-832
Author(s):  
D. V. Ardashev ◽  
L.V. Shipulin ◽  
A.S. Degtyareva-Kashutina
Keyword(s):  
Hydraulic Cylinder ◽  
Chromium Coating ◽  
Optimal Composition ◽  
Chromic Anhydride ◽  
Corrosion Resistant ◽  
Distinctive Features ◽  
Wear Resistant Coatings ◽  
Hard Chromium ◽  
Chromium Plating ◽  
Plating Method

We considered the processes of chromium plating the inner surfaces of the components of cylinders with hydrostatic guideways. We demonstrated the various aspects of the chromium plating process – the limitations placed on the machinery depending on the dimensions of the parts to be plated and the unevenness of the deposition rate of chromium along the length of the part. We developed a diagram of an installation for the application of a hard chromium coating on inner surfaces, which includes a cathode, an anode, a tank, and a pipeline. The distinctive features of the installation are the method of supplying the electrolyte at an angle to the horizontal, which allows us to supply the electrolyte through a turbulent flow swirling along a helical path, and the use of a chromium-plated installation casing. We studied various modes for applying a hard chromium coating on the inner surfaces of a hydraulic cylinder. As a result, we determined the optimal composition of the chromium electrolyte – the ratio of chromic anhydride and sulfuric acid – which is 10:1, respectively, and experimentally selected deposition modes. Chromium coatings obtained through the use of the concentrated electrolyte, which we developed, and the chromium plating method have 5...20% greater hardness and a 10...30-times reduction in porosity with the formation of a shiny, lumpy sludge, which corresponds to corrosion-resistant and wear-resistant coatings needed to manufacture hydraulic drives with highly efficient hydrostatic guideways.

scholarly journals On the tensile behaviors of a hard chromium coating plated on a steel substrate with periodic subsurface inclusions

2007 ◽  
Vol 201 (18) ◽  
pp. 7699-7705 ◽  
Author(s):  
Chen-Wu Wu ◽  
Ban-Quan Yang ◽  
Guang-Nan Chen ◽  
Kun Zhang ◽  
Jing-Hua Xiao
Keyword(s):  
Steel Substrate ◽  
Chromium Coating ◽  
Hard Chromium
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