Surface conditioner and surface conditioning method

Abstract

The invention provides a surface conditioner which can prevent an aluminum alloy from stray current corrosion in chemical conversion treatment and reduce the difference between contact and noncontact areas in conversion coating build-up on an aluminum alloy and which enables the formation of excellent chemical conversion coatings on various metal materials and a surface conditioner which can prevent metal from rusting after surface conditioning and is excellent in dispersion stability in a treating bath. A surface conditioner to be applied prior to the phosphating of metal which contains (A) zinc phosphate particles having D50 of 3 μm or below, (B) a water-soluble organic polymer, and (C) a layer clay mineral and has a pH of 3 to 12, characterized by further containing as the function imparting agent (D) a di- or tri-valent metal nitrite, zinc oxide and/or sodium hydroxide, or a nonionic or anionic surfactant.

Dependencies are inferred from the claim text.