In this paper exploring the pulse plating of chrome, the chrome growth kinetics determining nodule size and shape significantly depends on the duration of on-time rather than the duration of off-time and on/off-time ratio.

“Characterization of chrome layer formed by pulse plating”

Abstract of the paper “Characterization of chrome layer formed by pulse plating” in 2 lines:

  • The paper systematically studied the characterization of thin chrome layers prepared under various pulse plating conditions to improve their mechanical properties.
  • The higher current density enhanced nucleation rate, resulting in refining grain size, and the duration of on-time significantly influenced the chrome growth kinetics and wear resistance.

Conclusions from the paper “Characterization of chrome layer formed by pulse plating”:

  • Higher current density during pulse plating enhanced nucleation rate and refined grain size, improving mechanical properties.
  • The duration of on-time during pulse plating significantly influenced chrome growth kinetics, determining nodule size and shape, while the duration of off-time and on/off time ratio had a lesser impact.
  • The reduced wear resistance of pulse-plated chrome was attributed to increased grain size and relief of residual stress during off-time.
  • Pulse plating is an effective technique for producing crack-free chrome layers with refined grains and low porosity.
  • The study highlights the importance of pulse plating parameters in controlling microstructural development and mechanical properties of chrome layers.

Practical Implications of the Paper “Characterization of chrome layer formed by pulse plating”:

  • The study provides insights into improving the mechanical properties of thin chrome layers through pulse plating, which can have practical applications in industries where wear resistance and durability are crucial.
  • Understanding the influence of current density and pulse plating parameters on grain size and growth kinetics can help optimize the deposition process for desired microstructural properties.
  • The findings suggest that pulse plating can be an effective technique for producing crack-free chrome layers with refined grains and low porosity, which can enhance the performance and longevity of chrome-coated components.
  • The research highlights the importance of controlling the duration of on-time during pulse plating to achieve desired nodule size and shape, which can further contribute to improving the wear resistance of chrome layers.
  • The study contributes to the broader field of electroplating technology, providing valuable information for researchers and engineers working on developing advanced coating techniques with improved mechanical properties.

 

Methods used in this paper:

  • Chrome was electro-deposited from an electrolyte bath containing chromic acid and sulfuric acid using direct current density and pulse currents with varying on-off times. The deposition was carried out on a copper substrate using a potentiostat. Microstructural observation was done using transmission electron microscopy (TEM) and scanning electron microscopy (SEM).
  • Knoop microhardness testing was conducted on the cross-sectional areas of the chrome deposits to measure hardness.
  • Wear tests were performed using a Taber wear tester to evaluate the wear resistance of the chrome layers.
  • The morphology of the deposited chrome was observed using a scanning electron microscope (SEM).
  • The chrome layers were chemically separated from the copper substrate for microstructural observation using a transmission electron microscope (TEM).

Note: The methods used in the paper primarily focused on the electro-deposition process, microstructural observation, hardness testing, and wear resistance evaluation of the pulse-plated chrome layers.