Hi Tahere

This is not my field of expertise, but one of the researchers in my department, Prof. Roelf Sandenbergh (@ Roelof Feenstra Sandenbergh) works on this. Here is a link to a Master's dissertation on the topic: https://repository.up.ac.za/bitstream/handle/2263/50855/Chiyangwa_Evaluation_2015.pdf?sequence=1

He may also have other publications that are not currently shared on ResearchGate.

All the best

Johan

Tahereh Gholizadeh:

What is your cell (for the electrodeposited coatings) ?

Check this reference, it may be helpful.

https://doi.org/10.1016/j.jallcom.2009.09.146

Thanks.

Dr Anamika

Johan Zietsman

Thanks for your reply and the file.

Ioannis Samaras

0.1M Nickel sulphate

1M Boric acid

0.375 Sodium citrate

pH=7

agitation speed= 400rpm

The electrodeposition has been done in room temperature.

In addition to cracks the surface of the coatings are not smooth.

Dearest Tahere Golizadeh:

In order to help on cracks formation, your main issue, we need, also,

1) the cell's' electrodes (WE, RE, CE) and

2) the basic conditions (polarization, i, etc.) for the electrodeposited coating(s).

So, what is, actually, your cell (for the electrodeposited coatings) ?

Ioannis Samaras thanks for your reply again.

I have a two electrode cell. Counter and working electrodes are Pt and Cu plates, respectively, and the anode to cathode surface area ratio is about 2 (the cathode surface Area is 0.49cm2). I put the electrodes in a distance of 3.5 cm. Applied current density is 45 mA/cm2 (in the applied voltage of 3.9V).

I did not understand the polarization you asked.

Anamika Kadam Thanks.

This "polarization" (3.9V)[1] corresponds to a very high voltage "(in the applied voltage of 3.9V)".

Retry, electrodeposition, please, using (voltage) "polarization" near the value of 1V, or even less.

1. About your question on polarization : The 3.9V was your initial "polarization".

Ioannis Samaras

Thank you Dr. Samaras for your helpful recommends.

The resistance of the electrolyte resistance and current supply restriction made me use this voltage to get the desired current density. I will try the lowest voltage I can get from supply.