Aluminum Composite Corrosion Protection Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional aluminum composite materials for heat exchangers suffer from inadequate corrosion resistance, leading to significant mass loss and potential detachments under corrosive conditions, which compromises the service life and reliability of engines, especially in intercoolers and water coolers.
Innovation Solution
An aluminum composite material with a corrosion protection layer composed of an aluminum alloy with specific weight percentages of Si, Fe, Cu, Mn, Mg, Cr, Zn, and Ti, optimized to form a fine-grained recrystallized grain structure, is applied to the core layer, enhancing bonding properties and limiting corrosion spread.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional aluminum composite materials are used for heat exchangers, then manufacturing and processing are relatively simple, but corrosion resistance is inadequate leading to significant mass loss and potential detachments
Solution Approach 1:
The patent applies a multi-layer composite structure consisting of a core layer (AA3003 or AA3005 aluminum alloy) and a corrosion protection layer (AA5000 series aluminum alloy with 2-10% Mg). This composite material structure combines the good formability of the core layer with the superior corrosion resistance of the protection layer, achieving both manufacturing feasibility and enhanced corrosion protection against condensate attack in intercoolers
Solution Approach 2:
The patent modifies the chemical composition parameters of the aluminum alloy by adding specific amounts of magnesium (2-10% by weight) and controlling other alloying elements (Mn: 0.05-2%, Si: 0.05-1%, Fe: 0.05-1%, Zn: 0.05-1%, Ti: 0.01-0.5%, B: 0.001-0.05%). These parameter changes transform the material properties to achieve significantly improved corrosion resistance while maintaining adequate formability for heat exchanger manufacturing
2Productivity
If thinner wall thicknesses are used to reduce weight and cost, then productivity and efficiency improve, but the absolutely permissible depth of corrosion in the material becomes ever smaller
Solution Approach 1:
The patent uses a composite material structure where the corrosion protection layer (AA5000 series with 2-10% Mg) provides superior corrosion resistance, enabling the use of thinner wall thicknesses in the core layer without compromising the absolutely permissible depth of corrosion. The protection layer acts as a sacrificial barrier that prevents corrosion penetration into the thin-walled core structure
Solution Approach 2:
The corrosion protection layer serves as a pre-applied protective barrier that cushions the thin-walled core layer against corrosive condensate attack. This beforehand protection allows the design to use thinner walls while maintaining adequate corrosion margins, as the protection layer absorbs the corrosive damage before it can affect the structural integrity of the thin core material
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides extreme low material loss and improved bonding, preventing coarse detachments even under extreme corrosive conditions, ensuring the structural integrity and longevity of heat exchanger components.
Implementation Method 1
the material of the core layer acts as a sacrificial anode
Implementation Method 2
optimized to form a fine-grained recrystallized grain structure
Data Source
Figure 1
Figure 2a~2b
Figure 3
AI summary
The invention relates to an aluminum composite material, comprising at least one core layer (4) having an aluminum core alloy and at least one corrosion protection layer (6) provided on the core layer (4). The aim of specifying an aluminum composite material having further improved corrosion resistance, in particular to avoid coarse separations under corrosive conditions, is achieved in that the corrosion protection layer (6) has an aluminum alloy having the following composition in % by weight: Si ≤ 0.10 %, Fe ≤ 0.6 %, Cu ≤ 0.2 %, 0.9 % ≤ Mn ≤ 1.2 %, Mg ≤ 0.10 %, Cr ≤ 0.3 %, Zn ≤ 0.1 %, Ti ≤ 0.1 %, remainder Al and unavoidable contaminants, individually at most 0.05 %, in total at most 0.15 %. The invention further relates to a method for producing an aluminum composite materia (2), to a use, and to a heat exchanger, or to a component of a heat exchanger.