optimal water management solutions
Published

Plating On Beryllium/Copper Alloys

We are using the same cleaning process that’s used for other copper alloys that we plate. Invariably with the copper beryllium alloys, we see etching on the parts. How can we solve this problem?

Share

 Q. You probably have answered this question many times before, but I need a solution. I have difficulty plating copper on heat-treated beryllium copper alloys. We are using the same cleaning process that’s used for other copper alloys that we plate. Invariably with the copper beryllium alloys, we see etching on the parts. How can we solve this problem? J.W. 

 
A. You’re correct; I have addressed this problem in the past. However, there are always new readers that haven’t read every one of my 160-plus columns and it never hurts to ask a question. 
The culprit here is a mixture of beryllium and copper oxides that form during the heat treating process. These oxides are tough to remove and require special acid treatment. They can be removed by pickling with the following dip:
 
Component/Temp. | Concentration/Operating Range
Sulfuric acid  |  15–20%
Peroxide (stabilized)  |  3–4%
Temperature  |  120–130°F
 
 
Another formulation for removing these oxides is as follows:
 
Component/Temp. | Concentration/Operating Range
Phosphoric acid  |  38%
Nitric acid  |  2%
Acetic acid  |  60%
Temperature  |  150–165°F
 
 
The concentration of water and nitric acid control the removal rate. After suitable rinsing, the parts are ready for the plating bath. Follow all safety precautions when working with these baths.
 

Related Content

  • An Overview of Electroless Nickel Plating

    By definition, electroless plating is metal deposition by a controlled chemical reaction.

  • Trivalent Chrome Overview

    As the finishing industry begins to move away from the use of hexavalent chromium to trivalent chromium, what factors should finishers consider as they make new investments? Mark Schario, chief technology officer for Columbia Chemical offers a helpful overview of this complicated topic.

  • Advantages to Pumped Eductor Agitation

    Not all agitation methods are created equally. Pumped agitation with eductor nozzles can improve process tanks and quickly show a reduction in operating costs while keeping staff safe, following environmental legislation and preventing pollution.

optimal water management solutions
In-Place Repairs for Canning Presses
Luster-On Products
Hitachi High-Tech FT200 series
Products Finishing Top Shops Benchmarking Survey
PMTS 2025 Register Now!
Mocap Masking Caps Plugs Tapes
Pretreatment Washer and Finishing Equipment
optimal water management solutions