Electroless brass plating method and product-by-process
AssigneeCentro de Investigaciq Materiales Avanzados, S.C.
InventorsCarlos Dominguez-Rios, Alfredo Aguilar-Elguezabal, Myriam Moreno-Lopez, Silvia Miranda-Navarro
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Abstract
An electroless brass plating method for applying an uniform and thick metallic layer on metallic, ceramic or plastic pieces, which does not depend on the piece geometry nor on its electric characteristics and by which global costs are reduced approximately 50% thanks to the use of a zinc compound as source of zinc atoms, which is less expensive than zinc cyanide.
Claims78
An electroless brass-plating method for providing a brass layer to a metallic piece comprising the steps of:
- submitting the piece to an alkaline degrease;
- performing a first rinsing to the piece;
- submitting the piece to a cathodic degrease;
- performing a second rinsing to the piece;
- submitting the piece to an electroless brass-plating for providing a brass layer on the piece's surface, by submerging the piece in a solution containing:
- oxide zinc, as source of zinc atoms, copper cyanide as source of copper atoms, a complexing agent, a buffer type substance and a pH controller;
- performing a third rinsing;
- submitting the piece to a fixing treatment for fixing the brass layer to the piece's surface and
- drying the piece.
An electroless brass-plating method for providing a brass layer to a ceramic or plastic piece comprising the steps of:
- submitting the piece to an alkaline degrease;
- performing a first rinsing to the piece;
- submitting the piece to an electroless brass-plating for providing a brass layer on the piece's surface, by submerging the piece in a solution containing:
- oxide zinc, as source of zinc atoms, copper cyanide as source of copper atoms, a complexing agent, a buffer type substance and a pH controller;
- performing a second rinsing;
- submitting the piece to a fixing treatment for fixing the brass layer to the piece's surface and
- drying the piece.
A brass-plated metallic piece product, produced using an electroless brass-plating process for providing a brass layer to said metallic piece, said process comprising the steps of:
- submitting the piece to an alkaline degrease;
- performing a first rinsing to the piece;
- submitting the piece to a cathodic degrease;
- performing a second rinsing to the piece;
- submitting the piece to an electroless brass-plating for providing a brass layer on the piece's surface, by submerging the piece in a solution containing:
- oxide zinc, as source of zinc atoms, copper cyanide as source of copper atoms, a complexing agent, a buffer type substance and a pH controller;
- performing a third rinsing;
- submitting the piece to a fixing treatment for fixing the brass layer to the piece's surface and
- drying the piece.
A brass-plated ceramic or plastic piece product, produced using an electroless brass-plating method for providing a brass layer to said ceramic or plastic piece, said process comprising the steps of:
- submitting the piece to an alkaline degrease;
- performing a first rinsing to the piece;
- submitting the piece to an electroless brass-plating for providing a brass layer on the piece's surface, by submerging the piece in a solution containing:
- oxide zinc, as source of zinc atoms, copper cyanide as source of copper atoms, a complexing agent, a buffer type substance and a pH controller;
- performing a second rinsing;
- submitting the piece to a fixing treatment for fixing the brass layer to the piece's surface and
- drying the piece.
Dependencies are inferred from the claim text.