US 6,264,817 B1 · Method for microplasma oxidation of valve metals and their alloys

Abstract

A component is immersed into an electrolyte with a specific speed and an initial polarizing current intensity is applied, which is high enough to generate on the surface of the treated component, which is immersed in the electrolyte, moving microplasma discharges. The component is held until the formation of a coating of a specific thickness. The lowering phase of the voltage, at which a coating forms, is carried out by lowering the voltage to a value which corresponds with the beginning of the extinction of the microplasma discharges and then maintaining it until the complete extinction of the isolated wandering microplasma discharges. Then the component is taken out of the electrolyte and is cooled. The method is realized with a device, containing a tank with a cooling agent, in which the electrolytic bath is located, a control block, and a mechanism to vertically and horizontally move the treated component with the capability of moving with this mechanism the given component out of the electrolytic bath in the tank with the cooling agent.

Claims4

Dependent claims

A method for microplasma oxidation of valve metals and their alloys, including the following steps:

immersion of the component in the electrolyte,
application of an initial polarizing current power in an electric circuit, which is high enough to generate on the surface of the component, which is immersed in the electrolyte, moving microplasma discharges,
holding of the component until the formation of a coating of a specific thickness, and
removal of a forming voltage and taking out the component and then rinsing the component, characterized in that the immersion of the component in the electrolyte is done at a constant speed which is determined by the relation:
V=A·exp(B·N)
with:
V=immersion speed of the component, dm2/min;
N=output power of the power supply, N-(0.05-3)·105 (Volt·Ampere);
A—(0.05-0.5)dm2/min;
B=(1.5-2.5)×10−5(1/Volt·Ampere),
and after the formation of the coating is completed, the voltage in the electric current is lowered until isolated wandering microplasma discharges appear on the treated surface;
and the treated surface of the component, which is immersed in the electrolyte, is held therein until complete extinction of the isolated wandering microplasma discharges occurs.

9 more elements

Dependencies are inferred from the claim text.

Method for microplasma oxidation of valve metals and their alloys

Life of this patent

Method for microplasma oxidation of valve metals and their alloys

Life of this patent

Abstract

Claims4