MANUFACTURING METHOD OF WATER SUPPLY EQUIPMENT MADE OF COPPER ALLOY IN FAUCET FITTING OR VALVE, AND WATER SUPPLY EQUIPMENT MADE OF COPPER ALLOY

摘要

PROBLEM TO BE SOLVED: To provide a manufacturing method of water supply equipment containing antimony to improve dezincification resistance and stress corrosion cracking resistance while suppressing the leaching amount of the antimony and thereby suppressing an adverse effect to tap water, when manufacturing water supply equipment made of a copper alloy in a faucet fitting or a valve and liquid contact parts thereof by using a brass alloy superior in manufacturing performance, antibacterial property, recycling property and economical efficiency.SOLUTION: An etching treatment with a dilute sulfuric acid + hydrogen peroxide is applied onto a brass surface of water supply equipment including a γ phase dissolving antimony in a solid solution state to activate the surface. By performing at least one of film formation on the brass surface after the etching treatment and suppression of a liquid contact area of the brass surface of the water supply equipment, the antimony leaching from the water supply equipment to tap water is suppressed to a water quality threshold value or less.SELECTED DRAWING: Figure 1