Richard

Re: Hello !

Post treatment after plating

Hi !
Can you help me ?

Situation:
We have to rebuild an undermin outside diameter on titanium base alloy with a base coat of electroless nickel (AMS2404)
followed by sulfamate nickel (AMS2424)
Total thickness required .006' approx.

Questions:
Do we have to bake between both plating if performed within 2 hours ?
If yes:
Temperature & cycle time ?

If no:
We apply the sulfamate plating on top to reach the required thickness.

Questions:
What is the recommended post treatment ?
According to AMS2424: No specification about temp/ cycle on titanium parts, only hydrogen embrittlement on ferrous parts and it refers to AMS2759/9

Questions:
For this particular case mentionned as above:
If a post bake is performed:
May we have any adhesion problem, if part is baked at 375°F for 3 hours or
at 275°F for 5 hours ?

Hoping quick answer from you !
Thank You in advance!

Regards !

Labrat

Re: Hello !

Unless the spec defines otherwise, I would recommend processing in the sulfamate nickel immediately after the electroless nickel. This way the nickel remains active, thus better chance of success with adhesion of nickel sulfamate over the EN. If baked between these steps, you would have to ensure the nickel is reactivated before processing in the nickel sulfamate.
Electroless nickel contributes less hydrogen embrittlement than electrolytic nickel. Again, unless the spec states otherwise, I would wait until both plating steps are complete before baking.
In my experience, baking the nickel can actually promote adhesion, rather than decrease the adhesion. So no, I would not think that these times and temperatures you mentioned would affect the adhesion. If you plan to bake, you should do so soon after plating.

Southern Metal Finishing

Re: Hello !

"3"

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