STEEL TUBING WITH ALUMINIZED COATING COMPOSITIONS FOR REFRIGERATOR APPLICATION
Publication Date: 2010-Feb-09
The IP.com Prior Art Database
The present invention relates to the manufacture of tubings for use in refrigerator sealed systems that are more resistant to corrosion. The use of steel tubings is suggested for the purpose. The steel tubings are covered first with an alloy containing zinc or aluminum and then with aluminum rich epoxy resin topcoat. The use of these materials synergistically enhances the corrosion resistance and increases the reliability of the tubings.
The present invention relates generally to sealed system refrigeration appliances and, more particularly to refrigeration appliances with steel tubing and aluminized coating compositions.
In general, household appliances are available in various platforms having different structures, operational features, and controls. Conventional refrigerators typically include a compressor, an evaporator, and a condenser in a closed refrigeration circuit, and a number of fans that facilitate the refrigeration circuit with direct cooled air into refrigeration compartments. Collectively, these components may be referred to as a sealed system. Typically, the sealed systems use a metal tubing, such as a copper tubing, a steel tubing with a copper flash, or zinc-aluminum coatings on the metal tubing.
However, these conventional systems have major drawbacks. For example, the copper commodity value has steadily risen to extreme levels, and thus costs associated with using copper have risen. Further, the steel tubing is known to have a low corrosion resistance. On average, conventional tubes pass only 500 hours of ASTM B117 salt spray tests. Because the tubes are often exposed to corrosive elements or environments, the low corrosion protection may cause premature failure of the sealed system. Currently, a techinique does not exist that utilizes less expensive materials for tubing and improving the performance of such tubing.
It would be desirable to have a technique that provides a less expensive material for refrigerator tubing and also protects such tubing from corrosions.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is an exemplary embodiment of a refrigerator tubing in accordance with the present invention.
The invention relates to the manufacture of tubings for use in refrigerator sealed systems that are more resistant to corrosion than the tubings known in the art. The use of steel tubings is suggested for the purpose. The steel tubings are covered first with an alloy containing zinc and aluminum and then with an aluminum rich epoxy resin topcoat. The use of these materials synergistically enhances the corrosion resistance and increases the reliability of the tubings.
Figure 1 illustrates a diagram of refrigerator tubing that comprises a less expensive material...