Aluminum or aluminum alloy material, and production method therefor
AssigneeART1 Inc.
InventorsShigenori Tanaka, Kazuhito Nishinaka, Masahiro Akimoto
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Abstract
[Problem to be Solved] To develop a material of aluminum anode-oxidization layer with an antistatic performance and hardness. [Means for Solving Problem] The present invention provides a material having the combination of antistatic, electro-magnetic shield, and electric conductive properties immediately provided to practical use which are not known conventionally by forming 10-1000 cracks having a width from 0.1-10 μm per arbitrary one end face of 1 cm2, depositing or precipitating metal in and nearby the cracks, and then forming between a substrate and a surface an electric-conductive layer not more than 103Ω.
Claims13
An aluminum or aluminum alloy material comprising an anode-oxidization film structure having an anode-oxidization film, a barrier layer and electric conductive metal on a surface of an aluminum base substrate,
- wherein cracks having widths of 0.1-10 μm viewed from a surface of the anode-oxidation film are present in a range of 10-1000 per 1 cm2 on average and the electric conductive metal is present in the cracks and near surfaces of the cracks,
- wherein 5% or more of a total crack number reaches the aluminum base substrate passing through the barrier layer,
- wherein a volume resistance value between the surface of the anode-oxidization film and the aluminum base substrate is not more than 1000 (103) Ω measured by a 4-terminal method, and
- wherein the anode-oxidization film has a hardness not less than Vickers Hardness of HV300.
A method of producing an aluminum or aluminum alloy material comprising an anode-oxidization film structure having an anode-oxidization film, a barrier layer and electric conductive metal on a surface of an aluminum base substrate, the method comprising:
- forming the anode-oxidization film and the barrier layer by an anode-oxidization process at 0° C.-25° C.;
- forming 10-1000 cracks per 1 cm2 on average in the anode-oxidation film, the cracks having widths of 0.1-10 μm when viewed from a surface of the anode-oxidization film, by heating to 100-350° C. in a liquid or in a gas at atmospheric pressure or reduced pressure;
- and
- depositing and/or precipitating the electric conductive metal in the cracks and near surfaces of the cracks,
- wherein 5% or more of a total crack number reaches the aluminum base substrate passing through the barrier layer,
- wherein a volume resistance value between the surface of the anode-oxidization film and the aluminum base substrate is not more than 1000 (103) Ω measured by a 4-terminal method, and
- wherein the anode-oxidization film has a hardness not less than Vickers hardness of HV300.
Dependencies are inferred from the claim text.