Sn-Bi ALLOY-PLATED STEEL SHEET SUPERIOR IN WHISKER RESISTANCE AND SOLDER WETTABILITY

Sn-Bi ALLOY-PLATED STEEL SHEET SUPERIOR IN WHISKER RESISTANCE AND SOLDER WETTABILITY

PROBLEM TO BE SOLVED: To provide a surface treated steel sheet which never contains Pb, has adequate wettability with a Pb-free solder, and never forms whiskers. SOLUTION: In an Sn-Bi alloy plated steel sheet having an Sn-Bi alloy-plated film on at least one surface of the steel sheet, this Sn-Bi al...

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Hauptverfasser: KATO CHIAKI, NAKAKOJI NAOMASA, TANAKA TAKUMI
Format: Patent
Sprache:eng
Schlagworte:
ALLOYS
APPARATUS THEREFOR
CHEMISTRY
ELECTROFORMING
ELECTROLYTIC OR ELECTROPHORETIC PROCESSES
FERROUS OR NON-FERROUS ALLOYS
METALLURGY
PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS
TREATMENT OF ALLOYS OR NON-FERROUS METALS
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creator KATO CHIAKI
NAKAKOJI NAOMASA
TANAKA TAKUMI
description PROBLEM TO BE SOLVED: To provide a surface treated steel sheet which never contains Pb, has adequate wettability with a Pb-free solder, and never forms whiskers. SOLUTION: In an Sn-Bi alloy plated steel sheet having an Sn-Bi alloy-plated film on at least one surface of the steel sheet, this Sn-Bi alloy-plated steel sheet contains Bi controlled to 1 mass% or higher but 57 mass% or lower in the Sn-Bi alloy-plated film, and has the Bi concentration gradually decreased from the surface of the film toward the surface of the steel sheet. COPYRIGHT: (C)2004,JPO
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SOLUTION: In an Sn-Bi alloy plated steel sheet having an Sn-Bi alloy-plated film on at least one surface of the steel sheet, this Sn-Bi alloy-plated steel sheet contains Bi controlled to 1 mass% or higher but 57 mass% or lower in the Sn-Bi alloy-plated film, and has the Bi concentration gradually decreased from the surface of the film toward the surface of the steel sheet. 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subjects ALLOYS
APPARATUS THEREFOR
CHEMISTRY
ELECTROFORMING
ELECTROLYTIC OR ELECTROPHORETIC PROCESSES
FERROUS OR NON-FERROUS ALLOYS
METALLURGY
PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS
TREATMENT OF ALLOYS OR NON-FERROUS METALS
title Sn-Bi ALLOY-PLATED STEEL SHEET SUPERIOR IN WHISKER RESISTANCE AND SOLDER WETTABILITY
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