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Method of plating metal onto titanium

a technology of titanium and metal alloy, applied in the field of metal or metal alloy electroplating on titanium, can solve the problems of poor abrasion resistance, poor tribological properties, and little use of titanium and titanium alloys in mechanical engineering applications

Inactive Publication Date: 2009-04-09
SIFCO SELECTIVE PLATING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0019]An advantage of the present invention is a method of plating a metal onto a titanium part.
[0020]Another advantage of the present invention is a method of electroplating nickel onto a titanium alloy.
[0021]Another advantage of the present invention is a method of applying a metal to a titanium alloy using a selective, brush-plating process.
[0022]A still further advantage of the present invention is a method of plating as described above that does not use hydrofluoric acid to remove titanium oxide from the surface of the titanium part to be plated.
[0023]Another advantage of the present invention is a method of plating as described above that does not require a dry or wet blasting to prepare the surface of the titanium part to be plated.
[0024]These and other advantages will become apparent from the following description of a preferred embodiment taken together with the accompanying drawings and the appended claims.

Problems solved by technology

Despite the aforementioned properties, titanium and titanium alloys have found little use in mechanical engineering applications because of their poor tribological properties, namely, poor abrasive wear resistance, poor fretting behavior and high coefficient of friction.
However, the tenacity of the oxide layer makes its removal problematic.
However, the toxicity and health hazards associated with fluoride makes such an oxide-removal process undesirable.
However, as with fluoride cleaning, oxide quickly reforms on the surface of titanium following these cleaning processes and reduces adhesion.

Method used

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[0049]Using the foregoing process, nickel is brush plated onto a sheet of 6-4 Titanium. The titanium is kept under an electrical potential at all times following the initial surface cleaning step. The plated area is 100% covered by the brush pad 42, and the electrical potential is rapidly switched from anodic to cathodic. No rinsing occurs between steps, and the etching and plating solutions are not reused.

[0050]The process for producing nickel coatings on 6-4 Titanium is as follows:

StepOperationMaterialConditions1Abrading stepRed Scotch BriteWet with etching solution2Etching stepEtching solutionWet with etching solution,14 V anodic, 10 seconds3Activation stepEtching solutionWet with etching solution,4-8 V cathodic, 1 minute4Plating stepPlating solutionWet with plating solution,8-18 V cathodic, 0.078A * hr / cm2

[0051]The etching solution is comprised of 10% NaCl, 7% HCl, 1% Ni salts, 0.3% citric acid by weight. The plating solution is comprised of an acid nickel sulfate solution sold ...

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Abstract

A method of plating a metal onto a titanium surface comprising a surface cleaning step, an anodic etching step, a cathodic activation step and a plating step.

Description

FIELD OF THE INVENTION[0001]The present invention relates to the art of plating, and more particularly to a method of electroplating a metal or metal alloy onto titanium.BACKGROUND OF THE INVENTION[0002]Because of its high strength and low weight, titanium finds advantageous use in many applications in the aerospace, industrial, and medical fields. The strength, hardness, and working temperature of titanium can further be improved by alloying. An alloy of titanium that is easily available and widely used is 6-4 Titanium (also referred to as “Grade 5 titanium”). 6-4 Titanium consists of 6% by weight aluminum, 4% by weight vanadium and the balance being titanium.[0003]Despite the aforementioned properties, titanium and titanium alloys have found little use in mechanical engineering applications because of their poor tribological properties, namely, poor abrasive wear resistance, poor fretting behavior and high coefficient of friction. These tribological properties relate generally to ...

Claims

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Application Information

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IPC IPC(8): C25D5/34C25D17/14
CPCC25D5/06C25D17/12C25D17/00C25D5/38
Inventor RADATZ, DARRIN K.BRAIN, ANI YORDANOVACLOUSER, SIDNEY J.
Owner SIFCO SELECTIVE PLATING
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