tailieunhanh - Volume 13A - Corrosion Fundamentals, Testing, and Protection Part 15

Tham khảo tài liệu 'volume 13a - corrosion fundamentals, testing, and protection part 15', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Solidified products of cyclohexylamine dicyclohexylamine propylamine and butylamines with a concentre solution of benzylidene sorbite in organic acid are reported to have good protecting properties towards fei and nonferrous metals. Also 3 5-diphenyl or 3 5-bis- R-phenyl - 2 2 4-triazole where R is hydrogen alkyl hydroxyl is reported to protect gaseous or aqueous attack on Cu Ag Fe Al Ni and their alloys Ref 74 . Quaternary ammonium salts such as tetra-butyl tetra-methyl of valeric caprioic caprilic butyric laui myristic trydecylic palmitic stearic benzoic and carbamic acids and also 0- and p-nitrophenalates effective for steel Cu and brass Ref 75 . In another study tetrabutyl ammonium O-nitro phenate is r effective for steel and has no effect on Cu and brass Ref 76 . In atmospheres polluted with SQnd HS 4- H-1 2 4 triazole or its derivatives in combination with known inhibitors such as dicyclo-oxylamine nitrite urea and NgllOffective for Fe Al steel Cu Ag Zn Ni Sn Cd Mg Pb and their alloys Ref 77 . A Dutch patent Ref 78 describes the solution of an arom hydrocarbon an alkyl-metal nitrate and alkyl-substituted benzotriazole impregnated in paper to be effectivf metal articles made of Al Zn Cu steel and other metals and alloys. Substituted pyrazoles dissolved in water methanol or ethanol and impregnated in paper offer more prote than dicyclohexylamine nitrite towards atmospheric attack on Al Cu Zn Sn and other nonferrous metals 79 Anan et al. Ref 80 have tested a number of wood industry products as vapor phase inhibitors and reported that 2 5-dimethylfuran is an excellent inhibitor for nonferrous metals. Cast iron steel copf aluminum solder and other metals may be protected by the reaction product of 1 mole of cinnamic acid w to mole amine diethylamine triethylamine diethanolamine cyclohexylamine etc. with or without solvent like water Ref 81 . A product of 4- or 5-halohydroxy and or nitro-substituted benzotriazole with primary secondary or tertiary amine is .