Improvements in or relating to the treatment of iron and steel
Реферат: As a corrosion inhibitor in acid pickling baths for iron and steel is used a fatty material having 10-22 carbon atoms in an alkyl chain and an amino group substituted at least once along said chain, the amino group having one or two alkyl or alkylol substituents. The material, which is an alcohol, acid, ester or amide, preferably has the formula: <FORM:0858233/II/1> where m is 0-19, n is 0-4, p is 0-19, y is 0-17, and m + 2n + ny + 3 + p = 10-22; where either W or X is (-NR1R11H) + (An)- or -NR1R11; where W is H, OH, (-NR1R11H) + (An)- or -NR1R11 when X is (-NR1R11H) + (An)- or -NR1R11; where X is H, OH, (-NR1R11H) + (An)- or -NR1R11 when W is (-NR1R11H) + (An)-or -NR1R11; where R1 is an alkyl or alkylol radical, and R11 is H or an alkyl or alkylol radical; where Z is CH2OH, COOH, CONR1R11 or COOCsH2s NR11H; where s is 2-8; and where (An)- is an anion. Exemplified inhibitors are 9, 10 (10, 9) - diethanolaminohydroxystearic acid diethanolamine, , bis - and pentakis - [N, N - bis (b - hydroxyethyl)amino] stearic acid diethanolamide, - [N, N - bis (b - hydroxy-ethyl)amino] myristic acid diethanolamide, 9, 10 (10, 9) - butyl-ethanolaminohydroxystearic acid diethanolamide, , bis - and pentakis - aminohydroxystearic acid diisopropanolamide, diethanolamine condensate of hypochlorinated soya bean oil, 9, 10 (10, 9)-monoethanolaminohydroxystearic acid monoethanolamide, reaction product of chlorohydroxystearic acid and 2 - amino - 2 - methyl - 1, 3 - propanediol, 9, 10 (10, 9) - diethanolaminohydroxyoctadecanol, 11-dibutylaminoundecanoic acid, reaction product of -bromomyristic acid and dibutylamine, reaction product of dibromostearic acid and diethanolamine, reaction product of dibromostearic acid and dibutylamine, and reaction product of bromohydroxystearic acid and dibutylamine. Pickling acids referred to are sulphuric, hydrochloric, phosphoric and sulphanic acids. The inhibitors may also be added to the water rinse bath following on the pickling bath to prevent flash rusting. U.S.A. Specifications 2,277,016 and 2,445,892 are referred to.
Improvements in and relating to processes and apparatus for the electrolysis of "iron metal" salt solutions particularly of pickle liquors
Номер патента: GB774896A. Автор: . Владелец: Siemens and Halske AG. Дата публикации: 1957-05-15.