MANUFACTURE OF TIN-FREE STEEL EXCELLENT IN RETORT TREATMENT RESISTANCE

MANUFACTURE OF TIN-FREE STEEL EXCELLENT IN RETORT TREATMENT RESISTANCE

PURPOSE:To improve retort treatment resistance, by applying predetermined electron beams onto the surface of a chromium-coated steel sheet before being electrolytically chromated to reform water-soluble chromium oxide hydrate into a water-insoluble oxide film. CONSTITUTION:A thin steel sheet is coat...

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Hauptverfasser: TSUGAWA SHIYUNICHI, ICHIDA TOSHIROU, OGATA HAJIME, IMANAKA KEIKO
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Sprache:eng
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APPARATUS THEREFOR
CHEMISTRY
ELECTROFORMING
ELECTROLYTIC OR ELECTROPHORETIC PROCESSES
METALLURGY
PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS
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creator TSUGAWA SHIYUNICHI
ICHIDA TOSHIROU
OGATA HAJIME
IMANAKA KEIKO
description PURPOSE:To improve retort treatment resistance, by applying predetermined electron beams onto the surface of a chromium-coated steel sheet before being electrolytically chromated to reform water-soluble chromium oxide hydrate into a water-insoluble oxide film. CONSTITUTION:A thin steel sheet is coated with metallic chromium in an amount of 50-200mg/m per one side. Said coated surface is irradiated with electron beams of 0.5-10 Mrad. Hence, water-soluble chromium oxide hydrate having a high degree of hydration existent on the surface of the steel sheet after being chromium-coated is reformed into a water-insoluble oxide film. Thereafter, electrolytical chromating is performed in an aqueous solution mainly comprising chromic anhydride, a chromate or a perchromate. Hence, the coating film of chromium oxide hydrate in an amount of 5-30mg/m is formed on the surface of said metallic chromium layer. Thus, retort treatment resistance is improved.
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subjects APPARATUS THEREFOR
CHEMISTRY
ELECTROFORMING
ELECTROLYTIC OR ELECTROPHORETIC PROCESSES
METALLURGY
PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS
title MANUFACTURE OF TIN-FREE STEEL EXCELLENT IN RETORT TREATMENT RESISTANCE
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