Abstract: Provided are a copper-containing refrigerant pipe whose corrosion can be suppressed, a heat exchanger, and a method for producing a refrigerant pipe. A refrigerant pipe includes a pipe body including copper or copper alloy and an anticorrosive film formed on the outer surface of the pipe body. The anticorrosive film is obtained by applying a coating agent to the outer surface of the pipe body. The coating agent contains one or more anticorrosive agents selected from (A) an organic sulfonate compound, (B) a polyhydric alcohol-organic acid ester compound, and (C) an aliphatic amine compound having 8 to 24 carbon atoms. When the coating agent includes an anticorrosive agent of (C) the aliphatic amine compound having 8 to 24 carbon atoms, (C) the aliphatic amine compound having 8 to 24 carbon atoms is included in an amount of 2.0 wt % or more and 10.0 wt % or less in the coating agent.

Abstract: A copper-containing refrigerant pipe having an anticorrosive film, a heat exchanger, and a method for producing the refrigerant pipe are disclosed. The refrigerant pipe includes a pipe body including copper or a copper alloy and an anticorrosive film formed on the outer surface of the pipe body. The anticorrosive film is obtained by applying a coating agent to the outer surface of the pipe body. The coating agent contains one or more anticorrosive agents selected from the group consisting of (A) an organic sulfonate compound, (B) a polyhydric alcohol-organic acid ester compound, and (C) an aliphatic amine compound having 8 to 24 carbon atoms. When the coating agent includes an anticorrosive agent of (C) the aliphatic amine compound having 8 to 24 carbon atoms, (C) the aliphatic amine compound having 8 to 24 carbon atoms is included in an amount of 2.0 wt % or more and 10.0 wt % or less in the coating agent.

Abstract: Provided are a method for inspecting a refrigerant pipe, the method being able to quickly determine durability, and a refrigerant pipe confirmed to be highly durable. The method is a method for inspecting a refrigerant pipe containing copper or a copper alloy. In the method, the refrigerant pipe is exposed to an aqueous alkaline solution and inspected based on a color change of the refrigerant pipe due to exposure of the refrigerant pipe to the aqueous alkaline solution.

Abstract: A copper-containing refrigerant pipe having an anticorrosive film, a heat exchanger, and a method for producing the refrigerant pipe are disclosed. The refrigerant pipe includes a pipe body including copper or a copper alloy and an anticorrosive film formed on the outer surface of the pipe body. The anticorrosive film is obtained by applying a coating agent to the outer surface of the pipe body. The coating agent contains one or more anticorrosive agents selected from the group consisting of (A) an organic sulfonate compound, (B) a polyhydric alcohol-organic acid ester compound, and (C) an aliphatic amine compound having 8 to 24 carbon atoms. When the coating agent includes an anticorrosive agent of (C) the aliphatic amine compound having 8 to 24 carbon atoms, (C) the aliphatic amine compound having 8 to 24 carbon atoms is included in an amount of 2.0 wt % or more and 10.0 wt % or less in the coating agent.

Abstract: The heat exchanger includes heat transfer tubes 12, heat transfer fins 13a, which are arranged along a direction perpendicular to axes of the heat transfer tubes 12, cut-and-raised pieces 14, which are provided on a heat transfer surface of each heat transfer fin 13a. A cut, which extends along the lengthwise direction, is provided at the lower end or at the upper and lower ends of each cut-and-raised piece 14. The cuts guide condensed water generated on the surfaces of the heat transfer fins.