Abstract: Disclosed herein is an aqueous composition having a pH value at 55° C. in the range from 5 to 9, containing at least one different amino organophosphonic acid derivatives of formula (I) where residues R independently of each other are CH2—PO(OR?)2, residues R? independently of each other are alkylene residues with 2 to 4 carbon atoms, residues R? independently of each other are H, Na, K, Li or NH4; and n is an integer from 0 to 4; and at least one copolymer, which is water-soluble or water-dispersible Further disclosed herein are a concentrate to produce such compositions, a pickling method for pickling metallic substrates making use of the compositions, a coating method for coating metallic substrates including the pickling method and a method of using the compositions for pickling metallic substrates.

Abstract: Disclosed herein is an aqueous composition having a pH value at 55° C. in the range from 5 to 9, containing at least two different amino organophosphonic acid derivatives of formula (I) where residues R independently of each other are CH2—PO(OR?)2, residues R? independently of each other are alkylene residues with 2 to 4 carbon atoms, residues R? independently of each other are H, Na, K, Li or NH4; and n is an integer from 0 to 4; and where the at least two different amino organophosphonic acid derivatives differ in the value of n. Further disclosed herein is a concentrate to produce such compositions, a pickling method for pickling metallic substrates making use of the compositions, a coating method for coating metallic substrates including the pickling method and a method of using the compositions for pickling metallic substrates.

Abstract: Disclosed herein is a phosphonate-free, aqueous pickling composition having a pH value at 55° C. in the range from 5 to 9, and containing at least one copolymer, which is water-soluble or water-dispersible and selected from the group consisting of polyvinylpyrrolidones; the content of water being in the range from 95.0 wt.-% to 99.9 wt.-% based on the total weight of the composition. Further disclosed herein is a concentrate to produce such compositions, a pickling method for pickling metallic substrates making use of the compositions, a coating method for coating metallic substrates including the pickling method and a method of using the compositions for pickling metallic substrates.

Abstract: Described herein is an aqueous composition for removing cryolitic deposits from plants or parts of plants which serve for the conversion treatment of metal surfaces, said composition including a) at least one mineral acid, and b) at least one dicarboxylic acid of the formula HOOC—(CH2)x—COOH, where x is 0 to 3 and no borate-containing compounds have been added to the composition. Also described herein is a corresponding method for removing cryolitic deposits.

Abstract: A process for anticorrosion treatment of a metallic surface, including bringing the surface into successive contact with the an alkaline or acidic cleaner composition, a first rinsing composition, optionally a second rinsing composition, an acidic conversion composition, optionally a third rinsing composition, and a composition including a (meth)acrylate- and/or epoxide-based cathodic electrophoretic coating. At least one of the compositions includes at least one compound of the formula R1O—(CH2)x—Z—(CH2)y—OR2. R1 and R2 are each, independently of one another, H or an HO—(CH2)w— group with w?2. X and y are each, independently of one another, from 1 to 4 and Z is an S atom or a C—C triple bond. An aqueous composition for reducing corrosive removal of material in anticorrosion treatment of metallic surfaces is disclosed.

Abstract: An aqueous composition for reducing corrosive removal of material in pickling of metallic surfaces comprising bare and/or galvanized steel. The composition includes a mixture of a compound of the formula R1O—(CH2)x—C?C—(CH2)y—OR2 in which R1 and R2 are both H, and a compound of the formula R1O—(CH2)x—C?C—(CH2)y—OR2 in which R1 and R2 are each, independently of one another, an HO—(CH2)w— group with w?2. X and y are each, independently of one another, from 1 to 4 in each of the two compounds of the formula R1O—(CH2)x—C?C—(CH2)y—OR2. A process for pickling a metallic surface with reduced corrosive removal of material is disclosed.

Abstract: A process for anticorrosion treatment of a metallic surface, including bringing the surface into successive contact with the an alkaline or acidic cleaner composition, a first rinsing composition, optionally a second rinsing composition, an acidic conversion composition, optionally a third rinsing composition, and a composition including a (meth)acrylate- and/or epoxide-based cathodic electrophoretic coating. At least one of the compositions includes at least one compound of the formula R1O—(CH2)x—Z—(CH2)y—OR2. R1 and R2 are each, independently of one another, H or an HO—(CH2)w— group with w?2. X and y are each, independently of one another, from 1 to 4 and Z is an S atom or a C—C triple bond. An aqueous composition for reducing corrosive removal of material in anticorrosion treatment of metallic surfaces is disclosed.

Abstract: Described herein is an aqueous composition for removing cryolitic deposits from plants or parts of plants which serve for the conversion treatment of metal surfaces, said composition including a) at least one mineral acid, and b) at least one dicarboxylic acid of the formula HOOC—(CH2)x—COOH, where x is 0 to 3 and no borate-containing compounds have been added to the composition. Also described herein is a corresponding method for removing cryolitic deposits.

Abstract: An aqueous composition for reducing corrosive removal of material in pickling of metallic surfaces comprising bare and/or galvanized steel. The composition includes a mixture of a compound of the formula R1O—(CH2)x—C?C—(CH2)y—OR2 in which R1 and R2 are both H, and a compound of the formula R1O—(CH2)x—C?C—(CH2)y—OR2 in which R1 and R2 are each, independently of one another, an HO—(CH2)w— group with w?2. X and y are each, independently of one another, from 1 to 4 in each of the two compounds of the formula R1O—(CH2)x—C?C—(CH2)y—OR2. A process for pickling a metallic surface with reduced corrosive removal of material is disclosed.