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Raising Tensile strength in Nickel Sulfamate bath
Q. We are trying to increase tensile strength in our nickel sulfamate bath using saccharine up to highest level. We don't want to use phosphorus due to welding restriction.
Nickel level is optimum: 11oz/gal
Boric is 7 oz /gal
Chloride is higher then optimum level which is 1oz/gal.
Plating on st.steel coupon 0.002 micro inch
Using de-polarized s anodes.
plating 16 hours at 135 mA. Required tensile strength is above 165 KSI but always getting lower then that. We tried all conditions:
pH level is 4.2- to 4.5
Temp: 44.00 C
Elongation : suppose to be above 1 % but is lower always.
So, need any suggestion what is missing in the tank.
Chemist - Cedar Grove, NJ
October 1, 2025
A. Hi Jawed
Since you're looking for greater strength, what is missing is cobalt 🙂
Please contact NiCoForm [a finishing.com supporting advertiser].
Luck & Regards,
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
Ted is available for instant help
or longer-term assistance.
Q. Cobalt we have in between 3-5 % which we control by ICAP testing.
Optimum is 4% in the tank.
Chemist - Cedar Grove NJ
Q. I am still waiting for the answer.
Jawed Sabir [returning]Chemist - Cedar Grove NJ
A. Hi again Jawed.
I hope a reader will help you, but as we repeatedly note, this public forum doesn't work except when readers try to help each other. But some people post questions year after year, never trying to help anyone else with theirs, so it's not surprising that help sometimes doesn't come.
Luck & Regards!
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
Ted is available for instant help
or longer-term assistance.
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