초록 ▼

The present invention relates to an anti-corrosion composition, which contains: (a) at least a polyamine with a molecular weight greater than or equal to 320 and answering to the general formula: R－[NH－(CH2)3]n1－NH2 wherein R is a saturated or unsaturated aliphatic C12-C22 hydrocarbon radical; and n

The present invention relates to an anti-corrosion composition, which contains: (a) at least a polyamine with a molecular weight greater than or equal to 320 and answering to the general formula: R－[NH－(CH2)3]n1－NH2 wherein R is a saturated or unsaturated aliphatic C12-C22 hydrocarbon radical; and n1 is an integer varying between 1 and 7 inclusive, R and n1 being such that the molecular weight of the said polyamine is greater than or equal to 320; and (b) at least one alkylenephosphonic acid derivative selected from the group constituted by the aminoalkylenephosphonic acids derivatives and the alkylenepolyphosphonic acid derivatives. The invention further relates to the method for preparing the said composition. Said composition is useful to inhibit the corrosion of metallic surfaces caused by water, in liquid or steam form.

대표청구항 ▼

An anti-corrosion composition for a metallic surface in contact with water comprising at least a polyamine and at least an alkylene-phosphonic acid derivative, which composition is water-insoluble and contains: (A) at least a polyamine with a molecular weight at least 320 and having the general form

An anti-corrosion composition for a metallic surface in contact with water comprising at least a polyamine and at least an alkylene-phosphonic acid derivative, which composition is water-insoluble and contains: (A) at least a polyamine with a molecular weight at least 320 and having the general formula R－[NM－(CH2)3]n1－NH2 (1) wherein R is a saturated or unsaturated aliphatic C12-C22 hydrocarbon radical; and n1 is an integer varying between 1 and 7 inclusive, R and n1 being such that the molecular weight of the said polyamine is at least 320; and (B) at least one alkylenephosphonic acid derivative selected from the group consisting of (a) (i) the acids of formula [Figure] (II) wherein alk is an alkylene group containing C1-C6 and a straight or branched hydrocarbon chain, and (ii) their C1-C4 alkyl esters; (b) (i) the acids of formula (H2O3P－CH2)2N－(CH2)n2－N(CH2－PO3H2)2 (III) wherein n2 is an integer varying between 1 and 6 inclusive; and (ii) their C1-C4 alkyl esters; (c) (i) -di(hydroxyethyl)aminomethylphosphonic acid of formula (HO－CH2CH2)2N－CH2－PO3H2 (IV) (ii) its C1-C4 alkyl esters; and (d) (i) acids of formula Z1－O－(Z2－O)n3－Z3－N[(CH2)n4－PO3H2]2 (V) wherein Z1 is H or an C1-C5 alkyl group; Z2 is a C2-C5 alkylene group; Z3 is a C2-C5 alkylene group; n3 is an integer varying between 1 and 20 inclusive, and n4 is an integer varying between 1 and 4, and (ii) their C1-C4 alkyl esters.