ANTITARNISH AGENT FOR LEAD-CONTAINING ALLOY, WATER-BASE CLEANER COMPOSITION, RINSING AGENT, WATER-BASE CLEANING METHOD, AND WATER RINSING METHOD

• Main Authors: ZENFUKU KAZUKI, MAENO JUNICHI
• Format: Patent
• Language: English
• Published: 11.11.2004
• Edition: 7
• Subjects: ANIMAL AND VEGETABLE OILS, FATS, FATTY SUBSTANCES AND WAXES; CANDLES; CHEMICAL SURFACE TREATMENT; CHEMISTRY; CLEANING; CLEANING IN GENERAL; CLEANING OR DEGREASING OF METALLIC MATERIAL BY CHEMICALMETHODS OTHER THAN ELECTROLYSIS; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DETERGENT COMPOSITIONS; DETERGENTS; DIFFUSION TREATMENT OF METALLIC MATERIAL; FATTY ACIDS THEREFROM; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; PERFORMING OPERATIONS; PREVENTION OF FOULING IN GENERAL; RECOVERY OF GLYCEROL; RESIN SOAPS; SOAP OR SOAP-MAKING; TRANSPORTING; USE OF SINGLE SUBSTANCES AS DETERGENTS

PROBLEM TO BE SOLVED: To provide an additive for preventing discoloration of a lead-containing alloy represented by free cutting steel in the step of cleaning with a water-base cleaner or water-rinsing an optical component, an electronic component, a metal component or a ceramic component mounting a component made of the alloy, or the single component made of the alloy. SOLUTION: The antitarnish agent to be used for the lead-containing alloy comprises at least one of a carbonate expressed by the general formula (1): MaHb(CO3)n, (wherein a is 1 or 2; b is an integer of 0 to 2; n is 1 or 2; M is a metal atom having greater ionization tendency than lead has, or a volatile organic base; and H is a hydrogen atom), and at least one of nitrogen-based heterocyclic compounds; and has a ratio of carbonate/nitrogen-based heterocyclic compound (by a weight ratio) of 0.001 to 10,000. COPYRIGHT: (C)2005,JPO&NCIPI