Preparation method of anticorrosion film of energy-saving type heater condenser

A technology for condensers and water heaters, applied in the field of preparation of anti-corrosion films, can solve problems such as affecting safety, reducing the service life of water heaters, corrosion, etc., achieving high hardness and wear resistance, improving heat exchange efficiency, and excellent thermal conductivity. Effect

Inactive Publication Date: 2010-10-13
GUANGDONG MACRO GAS APPLIANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, CO and CO in the flue gas 2 , NO X , SO 2 Such acidic gases are dissolved in condensed water to purify the flue gas, which is beneficial to environmental protection. However, when the condensing water heater is burned, the flue gas contains acidic substances, and some of the acidic substances are absorbed by the condensed water to form highly corrosive acidic condensed water. The heat exchange equipment and flue gas pipes of the water heater reduce the service life of the water heater and affect its safety. During the use of the water heater, the condenser, a key component, is often in contact with acidic condensed water, causing severe corrosion and seriously affecting The service life and safety performance of the water heater. For this reason, domestic and foreign water heater manufacturers have used the anti-corrosion treatment of the condenser made of copper, or adopted the passivation treatment of the metal itself, or used electrophoretic epoxy resin coating, or used polyester Tetrafluoroethylene coating treatment, but the anti-corrosion effect is not ideal

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Embodiment 1

[0019] As shown in Figure 1, a kind of preparation method of the anti-corrosion coating of energy-saving water heater condenser of the present invention, it comprises following production steps:

[0020] Preparation of acidic electroless nickel plating solution for standby, according to chemical composition: NiSO 4 ·7H 2 O 25~35g / L, sodium hypophosphite (NaH 2 PO 2 )20~30g / L, sodium acetate (NaC 2 h 3 o 2 )5~15g / L, appropriate amount of catalytic stabilizer. Immerse the workpiece in the organic solution first, then put it into the ultrasonic oscillator, and oscillate ultrasonically for 10 to 15 minutes to remove the oil and oxide layer on the surface of the workpiece; rinse it with tap water, then rinse it with deionized water, and put the washed workpiece directly Put it into the polishing solution and stir for 5-10s, then put it into 5% dilute hydrochloric acid activation solution and soak for 30s, set the pH value of the prepared solution at 4.5-5, heat to a temperatu...

Embodiment 2

[0022] The difference between this embodiment and the above-mentioned embodiment is that the workpiece is put into the alkaline plating solution to generate the alkaline coating of the condenser. The alkaline plating solution is based on the chemical composition: NiSO 4 ·7H 2 O 25~35g / L, sodium hypophosphite (NaH 2 PO 2 ) 15-25g / L, ammonium citrate 45-55g / L, and an appropriate amount of catalytic stabilizer. In the electroless nickel plating process, the pH value of the alkaline plating solution is set at 8.5 to 10, and the temperature is 90±5°C. The alkaline coating of the condenser made of 10.27wt% phosphorus is then closed and coated on the surface of the workpiece. Protected by paint film, the surface of the coating is rougher than the acid coating, but the surface is uniform, free of pores and sundries.

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Abstract

The invention discloses a method for preparing corrosion resistant membrane for condensator of energy- saving heater. It comprises following steps: cleaning workpiece, putting it into polishing liquid for acid cleaning, activating with activating liquid, immersing activated workpiece in plating liquid, reducing nickle ion into metal nickle by using the surface of workpiece, decomposing hypophosphite and getting phosphorus and phosphite, forming Ni-P alloy coating layer on condensator surface, the coating possesses strong inactivating ability, and a thin layer of inactivating membrane is formed on the nickle metal surface. The Ni-P alloy coating is characterized by good heat conductivity, high rigidity and wearing resistance, and increased heat exchange rate for condensator.

Description

technical field [0001] The invention relates to the field of gas water heaters, in particular to a method for preparing an anti-corrosion film layer of a condenser of a gas water heater. Background technique [0002] At present, the condensing gas instant water heater is a high-efficiency, energy-saving and environment-friendly water heater. Condensation technology is currently the most energy-saving and environmentally friendly heat energy utilization technology. After the high-temperature flue gas in the condensing heat exchanger undergoes heat exchange, the water vapor in the flue gas condenses into water. At the same time, CO and CO in the flue gas 2 , NO X , SO 2 Such acidic gases are dissolved in condensed water to purify the flue gas, which is beneficial to environmental protection. However, when the condensing water heater is burned, the flue gas contains acidic substances, and some of the acidic substances are absorbed by the condensed water to form highly corros...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/32C23C18/18B08B3/12C23F3/06
Inventor 余少言仇明贵陈林山
Owner GUANGDONG MACRO GAS APPLIANCE
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