Method for producing a heat exchanger
AssigneeMahle International GmbH
InventorsPeter Englert, Thomas Gebauer
Life of this patent
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Abstract
A method for producing a heat exchanger having at least one cooling line with a lightweight metal base through which a water-based coolant can flow may include passivating a surface of the at least one cooling line, which is in contact with the coolant, before the at least one cooling line is filled with the coolant.
Claims19
A method for producing a heat exchanger having at least one cooling line with a metal base, through which a water-based coolant can flow, comprising:
- pretreating a surface of the at least one cooling line with a first pretreatment, the first pretreatment including a pickling treatment with an alkaline solution;
- and
- pretreating the surface with a second pretreatment after the first pretreatment, the second pretreatment including a pickling treatment with an acid mixture including sulphuric acid and phosphoric acid;
- passivating the surface, which is in contact with the coolant, before the at least one cooling line is filled with the coolant;
- wherein passivating the surface is carried out by a chemical treatment with a passivation solution constituted on the basis of one of an aqueous sulphuric acid solution or an organic acid solution, and wherein the passivation solution contains 0.1-1 wt % sebacic acid, 20-50 wt % zirconium carbonate, and 0.05-0.5 wt % triethanolamine;
- and
- wherein the alkaline solution has a pH value from 8-9.
A method for producing a heat exchanger having at least one cooling line with a metal base, through which a water-based coolant can flow, comprising:
- passivating a surface of the at least one cooling line, which is in contact with the coolant, before the at least one cooling line is filled with the coolant;
- prewarming the at least one cooling line before passivating the surface;
- and
- wherein passivating the surface is carried out by a chemical treatment with a passivation solution constituted on the basis of one of an aqueous sulphuric acid solution or an organic acid solution, and wherein the passivation solution contains 0.1-1 wt % sebacic acid, 20-50 wt % zirconium carbonate, and 0.05-0.5 wt % triethanolamine.
A method for producing a heat exchanger having at least one cooling line with a metal base, through which a water-based coolant can flow, comprising:
- passivating a surface of the at least one cooling line, which is in contact with the coolant, before the at least one cooling line is filled with the coolant;
- wherein passivating the surface is carried out by a chemical treatment with a passivation solution constituted on the basis of one of an aqueous sulphuric acid solution or an organic acid solution, and the passivation solution includes at least one corrosion inhibitor, which makes up 0.005-10 wt % of the passivation solution;
- and
- wherein the passivation solution contains 0.1-1 wt % sebacic acid, 20-50 wt % zirconium carbonate, and 0.05-0.5 wt % triethanolamine.
Dependencies are inferred from the claim text.