Radiator Inner Surface Coating via Inversion
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Solution Overview
Problem
Current anti-corrosion methods for heating radiator elements, such as electrophoresis, fail to completely protect the inner chambers of die-cast aluminum radiators due to the Faraday cage effect and air pocket formation, leading to incomplete paint penetration and lack of corrosion protection on internal surfaces.
Innovation Solution
An electrochemical deposition process using electrophoresis or cataphoresis painting with a polymeric coating, where the radiator elements are positioned vertically with the bottom facing upwards to prevent air pocket formation, ensuring complete coverage of the inner surfaces with a protective coating made of epoxy, acrylic, or fluorinated resins, and subsequent baking for drying and polymerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrophoresis painting is used to protect radiator elements, then external surfaces are coated, but internal chamber surfaces remain unprotected due to incomplete paint penetration
Solution Approach 1:
The invention divides the painting process into two distinct stages: first painting the external surfaces, then flipping the element to paint the internal chamber surfaces. This segmentation allows each surface to be treated separately with optimal paint application, ensuring complete coverage of both external and internal surfaces without the limitations of single-pass electrophoresis.
Solution Approach 2:
The invention applies the element in reversed orientation during the painting process. After painting the external surfaces, the element is flipped upside down so that the internal chamber surfaces face upward, allowing paint to properly penetrate and coat these previously inaccessible areas, thereby solving the Faraday cage effect and air pocket formation problems.
2Ease of manufacture
If elements are immersed in painting bath with bottom up position, then external surfaces can be painted, but air pockets form in the bottom preventing paint access
Solution Approach 1:
The invention systematically applies inversion by flipping the radiator element between painting stages. The element is first painted externally in the conventional position, then inverted so the internal chamber surfaces face upward for painting. This inversion eliminates air pocket formation and ensures complete paint penetration to all internal surfaces, achieving both manufacturing ease and reliable corrosion protection.
Solution Approach 2:
The invention performs preliminary painting of external surfaces before inverting the element for internal surface painting. This preliminary action allows the painting process to be staged appropriately, ensuring that each surface receives adequate paint application without interference from air pockets or the Faraday cage effect, thereby achieving complete coverage.
3Reliability
If bi-metal radiators are used with iron or brass core, then internal corrosion protection is achieved, but thermal efficiency is reduced
Solution Approach 1:
The invention changes the protective parameter from material composition (bi-metal construction) to surface treatment (electrophoresis painting). Instead of using iron or brass cores for corrosion resistance, the invention applies a protective paint coating to the aluminum surfaces, thereby maintaining the superior thermal conductivity of aluminum while achieving the required corrosion protection.
Solution Approach 2:
The invention creates a composite structure by combining aluminum base material with a protective paint coating. This composite approach provides corrosion protection similar to bi-metal radiators but without the thermal efficiency penalty, as the thin paint layer does not significantly impede heat transfer while the aluminum core maintains its excellent thermal conductivity.
4Reliability
If bi-metal radiators are used, then internal corrosion protection is provided, but weight of each element increases significantly
Solution Approach 1:
The invention changes the protection approach from using heavy ferrous materials (iron or brass) to applying a lightweight protective paint coating. This parameter change maintains corrosion protection while avoiding the significant weight increase associated with bi-metal construction, as the paint layer adds minimal weight compared to replacing aluminum with iron or brass.
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 method provides complete corrosion protection to all inner surfaces of the radiator elements, ensuring long-term functionality even with aggressive water, while being simple, cost-effective, and efficient, with the electrochemical deposition process ensuring thorough coverage and avoiding air pockets during treatment.
Implementation Method 1
electrochemical deposition process using electrophoresis or cataphoresis painting
Implementation Method 2
electrochemical deposition process using electrophoresis or cataphoresis painting with a polymeric coating
Implementation Method 3
subsequent baking for drying and polymerization
Implementation Method 4
subsequent baking for drying and polymerization
Data Source
Figure 1
Figure 2~4
Figure 3
AI summary
A heating radiator element (1) having a body (2) made of die -cast aluminium and provided with an inner chamber (5) for passing the water, delimited by inner surfaces (6) of the aluminium body (2), is provided with a protective coating (51) made of an anti- corrosion polymeric coating material applied to every inner surface (6) of the aluminium body (2) so as to completely coat the chamber (5), for protecting in use the inner surfaces (6) of the aluminium body (2) against the contact with water. The application of the protective coating (51) is carried out by filling the chamber (5) with a treatment composition containing the polymeric coating material, and then draining the chamber (5) once the coating material has adhered to the inner surfaces (6) of the chamber (5).