Aluminum surface treatment agent, treatment method, and treated aluminum

An aluminum surface treatment agent characterized in comprising:

• at least one fluorozirconium salt selected from the group consisting of ammonium salt, potassium salt, and sodium salt of fluorozirconium acid, and
• a polymer compound consisting essentially of a homopolymer of polystyrene sulfonic acid salt selected from the group consisting of ammonium salt, potassium salt, and sodium salt of polystyrene sulfonic acid.

An aluminum surface treatment agent comprising:

• 100-5,000 ppm of at least one fluorozirconium salt selected from the group consisting of ammonium salt, potassium salt, and sodium salt of fluorozirconium acid;
• and
• 1-100,000 ppm of a polymer compound consisting essentially of a homopolymer of polystyrene sulfonic acid salt selected from the group consisting of ammonium salt, potassium salt, and sodium salt of polystyrene sulfonic acid of number average molecular weight 500-1,000,000, wherein the pH of said agent is 2.5-4.5.

An aluminum surface treatment method characterized in that aluminum or an aluminum alloy is treated by an aluminum surface treatment agent comprising:

• a fluorometal acid or fluorometal acid salt comprising at least one metal selected from the group consisting of zirconium, titanium, hafnium, aluminum, silicon, germanium, tin, and boron, and
• a polymer compound consisting essentially of a homopolymer of polystyrene sulfonic acid or one of its salts.

An aluminum surface treatment method characterized in that the pH of an aluminum surface treatment agent comprising:

• 100-5,000 ppm of at least one fluorozirconium salt selected from the group consisting of ammonium salt, potassium salt, and sodium salt of fluorozirconium acid, and
• 1-100,000 ppm of a polymer compound consisting essentially of a homopolymer of polystyrene sulfonic acid selected from the group consisting of ammonium salt, potassium salt and sodium salt of polystyrene sulfonic acid of number average molecular weight 500-1,000,000,
• is adjusted to 2.5-4.5, and the agent is spray coated at a treatment temperature of 40-60.degree. C. for approximately 3 seconds-600 seconds.

Aluminum or an aluminum alloy on which a film is formed using an aluminum surface treatment agent comprising:

• a fluorometal acid or fluorometal acid salt comprising at least one metal selected from the group consisting of zirconium, titanium, hafnium, aluminum, silicon, germanium, tin, and boron, and
• a polymer compound consisting essentially of a homopolymer of polystyrene sulfonic acid or one of its salts.

Alumium or an aluminum alloy on which a film is formed using an aluminum surface treatment agent comprising:

• 100-5,000 ppm of at least one fluorozirconium salt selected from the group consisting of ammonium salt, potassium salt, and sodium salt of fluorozirconium acid, and
• 1-100,000 ppm of a polymer compound consisting essentially of a homopolymer of polystyrene sulfonic acid salt selected from the group consisting of ammonium salt, potassium salt, and sodium salt of polystyrene sulfonic acid of number average molecular weight 500-1,000,000;
• wherein the pH of said agent is 2.5-4.5.