... hardening alloys containing copper, lead, nickel and phosphorus. The nickel and phosphorus in the alloy combine to form nickel phosphate, which dissolves in the copper ... 97.8% copper, 1.0% lead, 1.0% nickel and 0.2% phosphorus, while C19140 is nominally composed of 98.3% copper ... , 0.5% lead, 1.0% nickel and 0.2% phosphorus. They are noted for their high corrosion resistance, high ...