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Bright dip on clear chromate parts





We are developing steel parts that require a clear chromate after the zinc plating. We have some samples but they look opaque if we compare them with other samples we have. Is there any process as bright dip that may be the responsible of the shiny parts? Or maybe it can be the status of chemicals involved on the process...

Thanks for your advice,

Felipe Castro
- Monterrey, Nuevo Leon, Mexico
 


Estimado Sr. Si he entendido bien su e mail, la respuesta seria que el brillo de las piezas metalicas cincadas y pasivadas, esta condicionado en gran medida por diversos factores: Por su material base, su tratamiento mecanico anterior (pulido,vibrado,etc),la densidad de corriente aplicada en el proceso,el tipo de baño aplicado (acido , alcalino), pero el factor esencial que determina el brillo, son los aditivos de brillo adicionados en el proceso de cincado y que pueden en la mayoria de los casos conseguir un brillo excelente en piezas "poco agraciadas" (referido al metal base. Esperando haberle sido util, un saludo desde España.

Miguel Angel Martin
Miguel Angel Martín
surface finishing shop
Madrid, Spain

 



Sounds like you may be using a cyanide zinc or alkaline zin process. To get bright parts you need to use a bright acid zinc process.

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
 




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