Tin-coated aluminum material

A method of manufacturing a tin-coated aluminum material,

• the tin-coated aluminum material comprising:
• a base material comprising aluminum or aluminum alloy;
• an anti-corrosion layer and an electrical contact layer formed on an outer layer of the base material, the electrical contact layer comprising tin or tin alloy;
• and
• aluminum oxide formed at an interfacial region between the base material and the anti-corrosion layer,
• said method comprising:
• continuously forming the anti-corrosion layer and the electrical contact layer on a surface of the base material in this order in a same airtight chamber,
• wherein the anti-corrosion layer comprises a metal selected from titanium, chromium and niobium or an alloy comprising the selected metal as a main component, and
• wherein the aluminum oxide at the interfacial region has a peak value of not less than 0.18 and not more than 0.8 in an abundance ratio of aluminum oxide=(aluminum oxide)/(aluminum+oxygen+the main component of the anti-corrosion layer+tin) where a resolution width is 2 nm for a quantitative analysis in a depth direction in an X-ray photoelectron spectroscopy or Auger electron spectroscopy.

A method of manufacturing a tin-coated aluminum material,

• the tin-coated aluminum material comprising:
• a base material comprising aluminum or aluminum alloy;
• an anti-corrosion layer and an electrical contact layer formed on an outer layer of the base material, the electrical contact layer comprising tin or tin alloy;
• a bonding layer comprising aluminum or aluminum alloy formed between the base material and the anti-corrosion layer;
• and
• aluminum oxide formed at an interfacial region between the base material and the bonding layer,
• said method comprising:
• continuously forming the bonding layer, the anti-corrosion layer and the electrical contact layer on a surface of the base material in this order in a same airtight chamber,
• wherein the anti-corrosion layer comprises a metal selected from titanium, chromium and niobium or an alloy comprising the selected metal as a main component, and
• wherein the aluminum oxide at the interfacial region has a peak value of not less than 0.18 and not more than 0.8 in an abundance ratio of aluminum oxide=(aluminum oxide)/(aluminum+oxygen+the main component of the anti-corrosion layer+tin) where a resolution width is 2 nm for a quantitative analysis in a depth direction in an X-ray photoelectron spectroscopy or Auger electron spectroscopy.