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  • Industrial-level quality PCB through hole plating

    For still interested people trying to do this with Sodium hypophosphite : it works fine! You need to take about 4/3 of the amount of CuSO4 of you Sodium Hyp. :)Greetz,Eric

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  • Industrial-level quality PCB through hole plating

    But by the way I am actually not sure that it will not work with sodium hypophosphite substite the calcium hyp. You will definately have to change the amounts but after what I read it should be possible anyhow

    If still interested: there is a way using Sodium Hypophosphite. to make an activator-solution like this one.After some testing and reading through the literatur our Lib, I figured out an easy way that works with stuff that can be freely bought. In germany, like in many other countries its hard to get calcium hyp. when you dont want to order from china for actually at least 100€ (for 1 kg - gets less when order big quantities) with shipping-costs.Well this is no receipe because Im still trying to normalize the procedure with best working parameters, but its at least one possible way to go.You need:sodium hypophosphite, Ammonium Hydroxide Copper-Sulfateand HCL acid,At first we need to get Hypophosphorous acid (the stuff your government won't like because its used to make crystal meth...see more »If still interested: there is a way using Sodium Hypophosphite. to make an activator-solution like this one.After some testing and reading through the literatur our Lib, I figured out an easy way that works with stuff that can be freely bought. In germany, like in many other countries its hard to get calcium hyp. when you dont want to order from china for actually at least 100€ (for 1 kg - gets less when order big quantities) with shipping-costs.Well this is no receipe because Im still trying to normalize the procedure with best working parameters, but its at least one possible way to go.You need:sodium hypophosphite, Ammonium Hydroxide Copper-Sulfateand HCL acid,At first we need to get Hypophosphorous acid (the stuff your government won't like because its used to make crystal meth) from the sodium-hypophosphite and the HCL-acid.Therefore you heat the sodium-hyp. to about 80C and put you HCL to it.As a result you'll get Hypophosphorous acid and salt.Cool down the solution to just over 0C for less soluability of salt and filter out the salt. Now you got a good acid with the clou that it can react with copper-salts to copper-hypophosphite, the main part of the reaction that syevtushenko described!But there will be the problem that the Hyp.Acid directly wants to reduce a solution of copper-salts to copper in front of your eyes. That is why you need to make the sulfate-solution not with water but with the ammonium-hydroxid-solution. It builds complexes that cant be reduced this way. So put some of the Copper Sulfate (doesnt matter with hydrated or not) with the ammonium hydroxid together till all the CuSo4 got dissolved. Try to make a nearly saturated solution.Then you put a little hypophosphorous acid to it and stirr.When you go on as described by syevtushenko with putting your clean pcb into it and heating up the stuff, the ammonium hydroxid fastly evaporates and you'll get your nano-copper on the surface.Of course you should use some soap, ethanol or tensides to make a solution that flews easily through the holes like described.If there is still a need for informations, feel free to ask. I hope that someone is helped by these informations that took much time for me to get Kind regards,Eric Pidun

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