Aluminum metal material having excellent conductivity, and production method therefor

Abstract

Problem to be SolvedTo develop material by providing electronic conductivity to an anode-oxidization film while having hardness than that of hard-anodized aluminum.Means for Solving ProblemThe present invention provides an excellent material keeping an electric resistance not more than 1×10−2Ω while having hardness not less than HV 470 as a film by removing a barrier layer used for an insulation material in the anode-oxidization film, and then forming a film with good electric conductivity by further depositing metal. The material has low resistance suitable to practical use and the excellent hardness, which have not been conventionally known as an aluminum material. This material can be produced by applying four-step electrolysis.

1 . A material consisting of aluminum or an aluminum alloy including an anode-oxidization film which has a performance of an electric resistance not more than 1×10 −2 Ω and a film cross-sectional hardness not less than HV470 in a Vickers hardness test. 
     
     
         2 . The material consisting of aluminum or an aluminum alloy of  claim 1 , wherein the material has the anode-oxidization film having corrosion resistance of the material not less than RN (rating number) 7 under a neutral salt-water spraying test for 720 hours. 
     
     
         3 . The material consisting of aluminum or an aluminum alloy of  claim 1 , wherein the material includes the anode-oxidization film without appearing cracks after heating at 200° C. for 30 minutes when viewed from a front side. 
     
     
         4 . The material consisting of aluminum or an aluminum alloy of  claim 1 , wherein the material includes the anode-oxidization film of which an electro-magnetic shield effect of the material having the anode-oxidization film of aluminum or aluminum alloy is not less than 30 dB in a range of 500 KHz-1 GHz. 
     
     
         5 . The material consisting of aluminum or an aluminum alloy of  claim 1 , wherein the material includes the anode-oxidization film of which heat resistance provides a color difference (ΔE) not more than 3.0 in a heat resistance test at 300° C. for two weeks before and after heating and cooling. 
     
     
         6 . The material consisting of aluminum or an aluminum alloy of  claim 1 , wherein the material includes the anode-oxidization film of which heat resistance provides a color difference (ΔE) not more than 3.0 in a heat resistance test at 500° C. for one hour before and after heating and cooling. 
     
     
         7 . The material consisting of aluminum or an aluminum alloy of  claim 1 , wherein the material includes the anode-oxidization film of which total emission rate is not less than 75% (0.75) in a middle far infrared region in a wavelength of 3-6 μm and is not less than 80% (0.80) in a middle far infrared—far infrared in a wavelength of 3-25 μm when a measurement temperature of measured substance is set to 100° C. and an emission rate of a full radiator is to be 100% (1.00). 
     
     
         8 . The material consisting of aluminum or an aluminum alloy of  claim 1 , wherein a thickness of a film is 6-50 μm and a color tone ranges from pale dark brown, deep dark brown to black. 
     
     
         9 . A production method for a material consisting of aluminum or an aluminum alloy including an anode-oxidization film, the method comprising:
 applying a first electrolysis using a first electrolysis solution including a first organic compound as a primary component and an inorganic compound or a second organic compound at a solution temperature of 0-40° C. and a current density of 0.6-3.0 A/dm 2  for 10-120 minutes;   applying a second electrolysis in the first electrolysis solution without turning off a power source for 1-5 minutes, then decreasing a voltage to 10 V stepwise by 1-10V while holding the voltage at a first predetermined duration, further then decreasing the voltage to 5V, 3V, 2V, 1V, and finally to 0V while holding the voltage for a second predetermined time duration;   applying a third electrolysis in an alkalic electrolysis solution at a solution temperature of 0-20° C. and the voltage of 1-30V for 5-20 minutes and then applying water rinsing; and   applying a fourth electrolysis in an acidic solution of pH 2-3.5 including a metal element at a solution temperature of 10-40° C., a current density of 0.1-2.0 A/dm 2  and a voltage of 5-40V for an electrolysis duration of 2-60 minutes;   wherein the material consisting of aluminum or an aluminum alloy and including an anode oxidization film has the anode-oxidization film of a volume resistance between a surface and a base substrate not more than 1×10 −2 Ω and a film cross sectional hardness not less than HV470.   
     
     
         10 . (canceled) 
     
     
         11 . The production method of  claim 9 , wherein a current or voltage waveform for an anode-oxidization processing of the aluminum or an aluminum alloy from the first electrolysis to the fourth electrolysis uses the waveforms selected from one, two or more combined waveform consisting of a direct current waveform, an alternative current waveform, an overlapped waveform of the direct current waveform and the alternative current, a pulsed waveform, and a PR-pulse waveform. 
     
     
         12 . (canceled)