Low-foaming corrosion inhibitors with microbiocidal properties, that contain alcanolamine-boric acid reaction products as the active ingredients

摘要

1. Low-foam microbiostatic or microbicidal corrosion inhibitors for iron, iron-containing metals, aluminium or aluminium-containing metals, consisting of (a) at least one reaction product of orthoboric acid and at least one alkanolamine, containing 2 or 3 carbon atoms per alkanol group, in a molar ratio of 1:1 to 1:4, and (b) at least one other component which consists of (b1 ) a mono-, di- or trialkanolamine salt of a maleamic acid of the formula I R-NH-CO-CH=CH-COOH where R is isoalkyl whose longest chain has 6 to 8 carbon atoms and which contains a total of 8 to 12 carbon atoms, or (b2 ) a compound of the formula II see diagramm : EP0015442,P7,F2 where R**1 is a linear or branched, saturated or olefinically or acetylenically unsaturated alkyl of 1 to 18 carbon atoms, or if R**1 is an unsaturated radical, it contains 3 to 18 carbon atoms, the alkyl optionally containing methoxy or ethoxy groups, or R**1 is cycloalkyl having 5 to 12 members, phenyl optionally substituted by alkyl of 1 to 3 carbon atoms, a methoxy or ethoxy group or halogen, or is phenylalkyl containing 1 to 5 carbon atoms per alkyl ; R**2 is hydrogen or R**1 ; R**1 and R**2 together with the nitrogen atom form a piperidine, piperazine, pyrrolidine or morpholine ring ; R**3 is alkylene of 2 to 5 carbon atoms ; and X**+ is an alkali metal or ammonium cation, or a cation derived from mono-, di- and trimethylamine, mono-, di- and triethylamine, mono-, di- and triisopropylamine, mono-, di- and triisobutylamine, 2-methoxyethylamine, 3-methoxypropylamine, 2-ethylhexylamine, mono-, di- and triethanolamine, 3-aminopropanol, cyclohexylamine, N,N-dimethylcyclohexylamine, morpholine, pyridine, quinoline, ethylenediamine, diethylenetriamine, pentaethylenehexamine or an ethoxylated or propoxylated primary amine, or is a proton, or consists of a mixture of (b1 ) and (b2 ), the weight ratio of (a) to (b) being 85:15 to 15:85.