Surface treatment method of aluminum heat exchanger
A heat exchanger and surface treatment technology, applied in the field of surface treatment of aluminum heat exchangers, can solve the problem of residual flux, lack of corrosion resistance and hydrophilicity, inability to obtain uniform chemical conversion film and hydrophilization Film and other problems, to achieve excellent corrosion resistance effect
Active Publication Date: 2021-10-29
NIPPON PAINT SURF CHEM +1
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Problems solved by technology
[0009] However, in aluminum heat exchangers manufactured by the NB method (hereinafter referred to as "NB heat exchangers"), flux will inevitably remain on the surfaces of fins, etc.
In this way, the surface state (potential state, etc.) of the fins and the like is not uniform, and as a result, a uniform chemical conversion film and a hydrophilized film cannot be obtained through subsequent treatments, and good corrosion resistance and hydrophilicity cannot be obtained. The problem
Method used
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Embodiment 1～38 and comparative example 1～6
[0169] [Preparation of chemical conversion treatment agent]
[0170] According to the currently known preparation method, the chemical conversion treatment agent is prepared by blending and mixing the contents of zirconium, titanium, vanadium and metal stabilizer and pH according to the conditions shown in Table 1 to Table 3. In addition, fluozirconic acid was used as a supply source of zirconium, fluotitanic acid was used as a supply source of titanium, and vanadyl sulfate was used as a supply source of vanadium. Each concentration in Table 1 to Table 3 can be calculated according to the compounding ratio.
[0171] [Preparation of hydrophilic treatment agent]
[0172] According to the currently known preparation method, by mixing the contents of the hydrophilic resin, the guanidine compound represented by the above general formula (1), the phosphorus compound, lithium ions and additives according to the conditions shown in Table 1 to Table 3 They were mixed and water was us...
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Abstract
The present invention provides a surface treatment method capable of imparting excellent corrosion resistance (white rust resistance) and moisture resistance (blackening resistance) to an aluminum heat exchanger. The surface treatment method of the aluminum heat exchanger includes: (a) performing a chemical conversion treatment on the aluminum heat exchanger with a chemical conversion treatment agent to form a chemical conversion film on the surface; (b) making the (a) process A step of contacting the aluminum heat exchanger after the chemical conversion film is formed on the surface with a hydrophilizing treatment agent containing a hydrophilic resin; and (c) by subjecting the aluminum heat exchanger after the contact treatment in the step (b) Sintering treatment to form a hydrophilized film on the surface; the chemical conversion treatment agent used in the step (a) contains at least one of zirconium and titanium and its content is 5 to 5000 mass ppm in total, and contains vanadium and its content It is 10-1000 mass ppm, the metal stabilizer is contained, and the content thereof is 5-5000 mass ppm, and pH is 2-6.
Description
[0001] The patent application for this invention is the international application number PCT / JP2013 / 056547, the international application date is March 8, 2013, the application number entering the Chinese national phase is 201380012367.9, and the name is "surface treatment method for aluminum heat exchanger" A divisional application of an invention patent application. technical field [0002] The invention relates to a surface treatment method of an aluminum heat exchanger. Background technique [0003] For aluminum heat exchangers used in automobile air conditioners, from the viewpoint of improving heat exchange efficiency, the surface area is generally made as large as possible. While arranging a plurality of fins at narrow intervals, the intricate Arrange the pipes that supply the refrigerant. In such a heat exchanger with a complicated structure, moisture in the air adheres to the surfaces of fins and tubes (hereinafter referred to as "fins and the like") as condensed w...
Claims
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IPC IPC(8): C23C22/83C23C22/44B05D3/02B05D3/10B23K1/00B23K1/20F28F13/18F28F19/06F28F21/08
Inventor 松井德纯水野晃宏和田优子法华淳介中村贤治广濑敬幸小林健吾
Owner NIPPON PAINT SURF CHEM