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 ?m 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.

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 ?m 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.

Abstract: This invention is related to a method for recovery of aqueous wash in a phosphate chemical conversion of a shaped metal product involving carrying out chemical conversion and subsequent cleaning with water, wherein said cleaning with water is performed in one or more stages and comprises a step of withdrawing aqueous wash from a first cleaning stage and adjusting the pH of the wash with at least one acid selected from the group consisting of phosphoric acid, nitric acid, hydrofluoric acid, hydrosilicofluoric acid and fluoroboric acid, a step of treating said pH-adjusted aqueous wash with a first reverse osmosis membrane to separate it into a first filtrate and a first concentrate, and a step of neutralizing said first filtrate with an alkali and treating the alkali-neutralized filtrate with a second reverse osmosis membrane to separate it into a second filtrate and a second concentrate, said first concentrate being recycled for said phosphate chemical conversion, said second filtrate being recycled as a

Abstract: This invention is related to a method for recovery of aqueous wash in a phosphate chemical conversion of a shaped metal product involving carrying out chemical conversion and subsequent cleaning with water,

Abstract: The present invention provides a highly durable surface-conditioning agent for use in a pretreatment step for a phosphate coating treatment of metallic materials, which is an aqueous solution comprising 1 to 50 ppm of titanium ion, 50 to 1,000 ppm or phosphate ion, 50 to 400 ppm of tripolyphosphate ion and 20 to 1,500 ppm of carbonate ion, with a tripolyphosphate ion/titanium ion weight ratio of 10 to 100, and having a pH of 8.5 to 10.0.

Abstract: A solution which is stored in a treatment bath is stirred by vibration stirring means provided in the treatment bath in a range of receiving a metal molded article or around a substantially horizontal surface of the metal molded article so that mean acceleration a expressed in the following equation is at least 8 cm/sec.sup.2 : ##EQU1## where X, Y and Z, which are in units of cm/sec.sup.2, represent average acceleration values of flow rate changes within 60 seconds, measured simultaneously in three axial directions of X, Y and Z which are perpendicular to each other at a measuring position.

Abstract: To treat an iron-based, zinc-based, and an aluminumbased surfaces etc. with zinc phosphate using the same solution, a treating solution is adjusted in concentrations so as to contain a simple fluoride in a range of 200.about.500 mg/l upon converting into a HF concentration and to contain a fluoride complex in a range shown in the following formula; ##EQU1## and also, it is adjusted in an active fluorine concentration so as to be 15.about.130 .mu.A at a value indicated by a silicon electrode meter. Instead of such adjusting, aluminum ions in the treating solution is precipitated in an outside of a treating bath to separate them from the treating solution and then, this treating solution may be returned in to the treating bath.

Abstract: To treat an iron-based, zinc-based, and an aluminum-based surfaces etc. with zinc phosphate using the same solution, a treating solution is adjusted in concentrations so as to contain a simple fluoride in a range of 200.about.500 mg/l upon converting into a HF concentration and to contain a fluoride complex in a range shown in the following formula; ##EQU1## and also, it is adjusted in an active fluorine concentration so as to be 15.about.130 .mu.A at a value indicated by a silicon electrode meter. Instead of such adjusting aluminum ions in the treating solution is precipitated in an outside of a treating bath to separate them from the treating solution and then, this treating solution may be returned into the treating bath.