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Water heater water tank inner container fluororesin coating corrosion preventing method

A technology for water heater liners and water heater tanks, applied in coatings, anti-corrosion coatings, devices for coating liquids on surfaces, etc., can solve problems such as accelerated corrosion, failure of enamel coating protection, sensitivity to collision phenomena, etc., and achieve excellent heat resistance and low temperature resistance, increase the adaptability of product selection, and reduce product cost

Inactive Publication Date: 2016-02-10
浙江融乐数字化太阳能有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the uncontrollable working temperature of solar water heaters, the water temperature of the water tank may exceed 80°C, and the enamel coating has the so-called "boiling erosion phenomenon" above this temperature, that is, above this temperature, the enamel coating has Accelerated corrosion and pinhole corrosion, resulting in failure of local enamel anti-corrosion protection
In addition, because the enamel coating is a brittle coating, it is sensitive to the impact phenomenon, and it is easy to produce cracks when it is impacted, which also easily leads to the failure of the enamel coating protection.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Preferred embodiment one: PVF (polyvinyl fluoride) coating is selected as the coating.

[0051] Process flow: Degreasing-surface pretreatment-spraying-sintering-cooling-post-treatment

[0052] Processing steps:

[0053] Degreasing: Use 380°C high temperature to remove impurities such as grease on the surface of the workpiece.

[0054] Surface pretreatment:

[0055] Use the sandblasting machine for the inner tank of the water heater, and use corundum for sandblasting to remove various impurities and oxide layers on the surface of the workpiece, making the surface suitable for spraying PVF (polyvinyl fluoride) resin coating.

[0056] Workpiece Surface Cleaning:

[0057] Use 0.6Mp high-pressure air blowing method to clean the surface of the workpiece after sandblasting.

[0058] Spraying: Powdered resin coating is sprayed by electrostatic spraying method. The powder particles are attached to the workpiece under the action of the electrostatic field. Sintering: Si...

Embodiment 2

[0062] Preferred embodiment two: select FET (F 46 Tetrafluoroethylene-hexafluoropropylene copolymer) coating as coating.

[0063] Process flow: Degreasing-surface pretreatment-spraying-sintering-cooling-post-treatment

[0064] Processing steps:

[0065] Degreasing: Use 380°C high temperature to remove impurities such as grease on the surface of the workpiece.

[0066] Surface pretreatment:

[0067] Use a sandblasting machine for the inner tank of the water heater, and use emery for sandblasting to remove various impurities and oxide layers on the surface of the workpiece, making the surface suitable for spraying FET (F 46 Tetrafluoroethylene-hexafluoropropylene copolymer) resin coating.

[0068] Workpiece Surface Cleaning:

[0069] Use 0.6Mp high-pressure air blowing method to clean the surface of the workpiece after sandblasting.

[0070] Spraying: Powdered resin coating is sprayed by electrostatic spraying method. The powder particles are attached to the wor...

Embodiment 3

[0075] Preferred embodiment three: PVDF (polyvinylidene fluoride) coating is selected as the coating.

[0076] Process flow: Degreasing-surface pretreatment-spraying-sintering-cooling-post-treatment

[0077] Processing steps:

[0078] Degreasing: Use 380°C high temperature to remove impurities such as grease on the surface of the workpiece.

[0079] Surface pretreatment:

[0080] Use a sandblasting machine for the inner tank of the water heater, and use corundum for sandblasting to remove various impurities and oxide layers on the surface of the workpiece, making the surface suitable for spraying PVDF (polyvinylidene fluoride) resin coatings.

[0081] Workpiece Surface Cleaning:

[0082] Use 0.6Mp high-pressure air blowing method to clean the surface of the workpiece after sandblasting.

[0083] Spraying: Powdered resin coating is sprayed by electrostatic spraying method. The powder particles are attached to the workpiece under the action of the electrostatic field....

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PUM

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Abstract

The invention relates to a method for conducting corrosion preventing protection on an inner container of a water heater water tank by adopting a fluororesin coating having a certain flexibility. The fluororesin coating has better protecting performance than an enamel coating. A coating process comprises the three steps of surface pretreatment, coating and sintering. The coated fluororesin coating has the advantages that the fluororesin coating has better corrosion resistance, heat resistance, humidity resistance, abrasion resistance and non-sticking performance compared with the enamel coating of the inner container of a water heater.

Description

technical field [0001] The invention relates to an anti-corrosion coating for the tank liner of a household water heater, in particular to an anti-corrosion coating for the tank liner of a solar water heater and an electric water heater. Background technique [0002] At present, most of the water tanks of pressurized solar water heaters and electric water heaters in China use enamel inner tanks to provide anti-corrosion protection for the water tanks. However, due to the uncontrollable working temperature of solar water heaters, the water temperature of the water tank may exceed 80°C, and the enamel coating has the so-called "boiling erosion phenomenon" above this temperature, that is, above this temperature, the enamel coating has Accelerated corrosion, pinhole corrosion phenomenon, resulting in failure of local enamel anti-corrosion protection. In addition, because the enamel coating is a brittle coating, it is sensitive to collision phenomena, and it is easy to produce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/22B05D7/24C09D127/12C09D5/08
Inventor 江希勤李德亮
Owner 浙江融乐数字化太阳能有限公司
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