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Chemistry Forums for Students => Physical Chemistry Forum => Topic started by: edeaton on April 17, 2022, 12:04:40 PM

Title: Gases form at anode during electro-etching process
Post by: edeaton on April 17, 2022, 12:04:40 PM

I do etchings of metal pieces via an electrolysis process. I have tried to find the answer to: What gases are formed in eletrolysis process when the electrolyte is water H2O and epsom salt (magnesium sulphate)MgSO4 and the anode is steel and the cathode is stainless steel. The anode is the piece that oxidizes and the cathode redoxes.

Title: Re: Gases form at anode during electro-etching process
Post by: billnotgatez on April 17, 2022, 12:25:53 PM

I got the below link after GOOGLE of

Quote

electrolysis of water and epsom salts

https://www.exploratorium.edu/snacks/indicating-electrolysis#:~:text=The%20Epsom%20salt%2C%20also%20know,electric%20current%20around%20the%20solution (https://www.exploratorium.edu/snacks/indicating-electrolysis#:~:text=The%20Epsom%20salt%2C%20also%20know,electric%20current%20around%20the%20solution)

Title: Re: Gases form at anode during electro-etching process
Post by: Borek on April 17, 2022, 06:36:32 PM

All other things present have much higher/lower redox potentials, so water will react first, both on the anode and the cathode.

Title: Re: Gases form at anode during electro-etching process
Post by: utelectrode on May 10, 2022, 10:00:16 PM

The most common gases used in etching are fluorine-based or chlorine-based. Common fluorine-based gases are CF4, SF6, CHF3, C4F8, etc. and chlorine-based gases are Cl2, BCl3, CCl4, etc. Most semiconductors and metals can be etched with these gases.