Hardener composition, comprising a benzoxazine-amine adduct which is selected from the group consisting of substances according to formula Ia, substances according to formula Ib or mixtures thereof, having the following structures: and where R 1, R 2, R 3, R 4 and R 5 are each independently selected from H, alkyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, arylalkyl, heteroalkyl, alkoxy, hydroxyl, hydroxyalkyl, carboxyl, halo, haloalkyl, amino, aminoalkyl, alkylcarbonyloxy, arylcarbonyloxy, alkoxycarbonyl, alkylcarbonyl, alkylsulfonylamino, aminosulfonyl, sulfonic acid or alkylsulfonyl groups, and also from combinations of two or more of these groups, it being possible for the groups to each be unsubstituted or optionally substituted; where R 6 and R 7 each independently represent H or an amino, diamino or polyamino group selected from the group consisting of aliphatic, alicyclic, aromatic or araliphatic amine groups and also combinations of two or more of these groups, it being possible for the groups to each be unsubstituted or optionally substituted; where Z is selected from a direct bond, -C -, -S-, -O-, -S -, -S 2 -, -C(R 8)(R 9)-, - [C(R 8)(R 9)] m -C(R 8)(R 9)-[C(R 10)(R 11)] n -, -[C(R 8)(R 9)] m -C(R 8)(aryl)-[C(R 10)(R 11)] n -, - [C(R 8)(R 9)] m -C -[C(R 10)(R 11)] n -, -[C(R 8)(R 9)] m -S-[C(R 10)(R 11)] n -, -[C(R 8)(R 9)] m -O-[C(R 10)(R 11)] n -, -[C(R 8)(R 9)] m -S 2 -[C(R 10)(R 11)] n -, a divalent heterocycle and -[C(R 8)(R 9)] m -arylene-[C(R 10)(R 11)] n -, where m and n are each, independently of one another, between 0 and 10, preferably between 0 and 5, and where R 8, R 9, R 10 and R 11 each independently have the same meaning as groups R 1 to R 5; and an amine which is reactive to epoxy groups and is selected from the group consisting of aliphatic, alicyclic, aromatic and araliphatic amines, and which has on average per molecule at least two reactive hydrogen atoms bonded to a nitrogen atom, characterized in that the curing agent composition contains at least one salt selected from the group consisting of salts of nitric acid, salts of nitrous acid, salts of halogens, salts of trifluoromethanesulfonic acid, and combinations thereof. where R 6 and R 7 each independently represent H or an amino, diamino or polyamino group selected from the group consisting of aliphatic, alicyclic, aromatic or araliphatic amine groups and also combinations of two or more of these groups, it being possible for the groups to each be unsubstituted or optionally substituted; where Z is selected from a direct bond, -C -, -S-, -O-, -S -, -S 2 -, -C(R 8)(R 9)-, - [C(R 8)(R 9)] m -C(R 8)(R 9)-[C(R 10)(R 11)] n -, -[C(R 8)(R 9)] m -C(R 8)(aryl)-[C(R 10)(R 11)] n -, - [C(R 8)(R 9)] m -C -[C(R 10)(R 11)] n -, -[C(R 8)(R 9)] m -S-[C(R 10)(R 11)] n -, -[C(R 8)(R 9)] m -O-[C(R 10)(R 11)] n -, -[C(R 8)(R 9)] m -S 2 -[C(R 10)(R 11)] n -, a divalent heterocycle and -[C(R 8)(R 9)] m -arylene-[C(R 10)(R 11)] n -, where m and n are each, independently of one another, between 0 and 10, preferably between 0 and 5, and where R 8, R 9, R 10 and R 11 each independently have the same meaning as groups R 1 to R 5; and an amine which is reactive to epoxy groups and is selected from the group consisting of aliphatic, alicyclic, aromatic and araliphatic amines, and which has on average per molecule at least two reactive hydrogen atoms bonded to a nitrogen atom, characterized in that the curing agent composition contains at least one salt selected from the group consisting of salts of nitric acid, salts of nitrous acid, salts of halogens, salts of trifluoromethanesulfonic acid, and combinations thereof.