Soldered aluminum heat exchanger

Abstract

A soldered aluminum heat exchanger, having tubes made of a core material through which tubes a coolant flows, and the tubes being connected to at least one header by means of an inner soldered joint; having a protective plating on the inner face of the core material comprising aluminum and using four-layer technology; having an inner solder plating on the protective plating; and having an outer solder plating on the outer face of the tube facing away from the coolant face.

1 . A soldered aluminum heat exchanger comprising:
 coolant-carrying tubes made of a core material that are connectable to at least one header by soldering of an inside thereof;   an aluminum-containing protective plating in a four-layer technology on the inside of the core material;   an inside solder plating on the protective plating; and   an outside solder plating on the outside of the tube facing away from the coolant side.   
     
     
         2 . The soldered aluminum heat exchanger according to  claim 1 , further comprising a protective plating containing a zinc-containing aluminum alloy. 
     
     
         3 . The soldered aluminum heat exchanger according to  claim 1 , further comprising a protective plating containing an aluminum-manganese base alloy with the addition of 0.2% to 10% zinc by weight, in particular between 1% and 8% by weight or between 2% and 6% by weight. 
     
     
         4 . The soldered aluminum heat exchanger according to  claim 1 , further comprising a zinc alloy for the protective alloy in terms of a zinc diffusion depth of 20-200 μm, in particular 40-150 μm, or in particular 50-120 μm, and a maximum zinc content of 0.1% to 8% by weight, in particular 0.5% to 6% by weight, more advantageously 1% to 4% by weight, determined in each case at the surface of the coolant side, in particular the inside surface of a flow-carrying tube of the aluminum heat exchanger. 
     
     
         5 . A soldered aluminum heat exchanger, comprising:
 coolant-carrying tubes made of a core material connectable by inside soldering to at least one header, in particular to a base or cover;   solder plating on the inside on the coolant side,   wherein the core material comprises aluminum 4045 or aluminum 4343 with 10% thickness, in four-layer technology;   a solder plating on the outside of the core material facing away from the coolant side;   a zinc-containing protective plating beneath this solder plating, in particular made of 3XXX series aluminum alloy with X% Zn (X=0.2-20%) or 7XXX series aluminum alloy with Y% Zn (Y=0.2-20%), and of targeted modifications of alloyed elements such as Mn, Cu, Si, and Fe.   
     
     
         6 . The soldered aluminum heat exchanger according to  claim 5 , further comprising an additional protective plating on the inside. 
     
     
         7 . The soldered aluminum heat exchanger according to  claim 5 , further comprising coolant-carrying tubes made of a core material connected by inside soldering to at least one header, in particular to a base or cover;—with solder plating, in particular 4045 or 4343 with 10% thickness, on the inside; and—with a zinc-containing protective plating on the outside of the parts of the heat exchanger to be assembled. 
     
     
         8 . The soldered aluminum heat exchanger according to  claim 1 , wherein the soldered aluminum heat exchanger is a condenser or an evaporator. 
     
     
         9 . The soldered aluminum heat exchanger according to  claim 1 , with a magnesium-containing alloy for the core material and inside soldering without flux. 
     
     
         10 . The soldered aluminum heat exchanger according to  claim 1 , with a magnesium-free alloy for the core material and inside soldering with the use of flux.