Method for treating ferrous alloy parts by sulphurization
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United States of America Patent
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Issued Date -
Jun 21, 2007
app pub date -
Oct 6, 2004
filing date -
Oct 14, 2003
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Abandoned
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Abstract
Ferrous alloy parts are immersed in a bath of an aqueous solution, without passage of an electric current. The solution comprises caustic soda at concentrations of between 400 and about 1000 f/l, sodium thiosulphate at concentrations of between 30 and about 300 g/l, and sodium sulphide at concentrations of between 60 and about 120 g/l. The solution is heated to a temperature between about 100.degree. C. and 140.degree. C. for a period of between 5 and about 30 minutes.
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