MEMBER FOR FORMING REFRIGERATING CIRCUIT

摘要

PROBLEM TO BE SOLVED: To clarify chemical instability that occurs when a refrigerant HFO-1234yf with a double bond in a molecule contacts with metal, and to provide a member for forming a refrigerating circuit with a metal surface taking measures for eliminating the chemical instability based on the clarification.

SOLUTION: The member for forming the refrigerating circuit with the metal surface is used for the refrigerating circuit using the specific refrigerant HF-1234yf formed of the molecule with the double bond. The metal surface contacted with the HFO-1234yf is coated by a coating layer substantially unreactive to the HFO-1234yf within a use temperature range. The coating layer is formed of one of a coating fixed on the metal surface, a coating layer formed by the adhesion of a specific component added in a lubricating oil, and a coating layer in which a metal surface layer forming the metal surface itself is modified.

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