Surface treatment process for valve body casting part

A technology of surface treatment and casting, which is applied in the field of surface treatment of valve body castings. It can solve problems such as corrosion resistance to be improved, ball valve failure, and difficulty in forming a sealed state, and achieve the effect of improving corrosion resistance.

Pending Publication Date: 2021-06-04
WENZHOU WANHONG VALVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The inner cavity of the valve is in the liquid for a long time, and it is impacted and corroded by the liquid. After the inner wall of the valve cavity is corroded, it is difficult to form a sealed state with the opening and closing parts, resulting in the failure of the ball valve. Therefore, its corrosion resistance needs to be improved.

Method used

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  • Surface treatment process for valve body casting part

Examples

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Effect test

Embodiment 1

[0039] A surface treatment process for a valve body casting, characterized in that it comprises the following steps:

[0040] S1, pretreatment of valve body castings: the cast valve body castings are sequentially washed with water, 10wt% hydrochloric acid pickling, water washed, and dried to obtain the pretreated valve body castings;

[0041] S2, the first surface treatment of the valve body casting: soak the pretreated valve body casting in the treatment agent for 5 minutes, remove and dry, and obtain the valve body casting after the first surface treatment.

[0042] The preparation method of treatment agent is as follows:

[0043] S1, pretreatment: Dissolve bis(dimercapto-1,3,4-thiadiazole) in acetone solution, filter with suction, evaporate the obtained filtrate to dryness under reduced pressure, dissolve it in 95wt% ethanol and recrystallize to remove acetone, Obtain pretreated bis(dimercapto-1,3,4-thiadiazole);

[0044] S2, in parts by weight, dissolve 4 parts of bis(di...

Embodiment 2

[0046] A surface treatment process for a valve body casting, characterized in that it comprises the following steps:

[0047]S1, pretreatment of valve body castings: the cast valve body castings are sequentially washed with water, washed with 10wt% hydrochloric acid, washed with water, and dried to obtain the pretreated valve body castings;

[0048] S2, the first surface treatment of the valve body casting: soak the pretreated valve body casting in the treatment agent for 5 minutes, remove and dry, and obtain the valve body casting after the first surface treatment.

[0049] The preparation method of treatment agent is as follows:

[0050] S1, pretreatment: Dissolve bis(dimercapto-1,3,4-thiadiazole) in acetone solution, filter with suction, evaporate the obtained filtrate to dryness under reduced pressure, dissolve it in 95wt% ethanol and recrystallize to remove acetone, Obtain pretreated bis(dimercapto-1,3,4-thiadiazole);

[0051] S2, in parts by weight, dissolve 6 parts of...

Embodiment 3

[0053] A surface treatment process for a valve body casting, characterized in that it comprises the following steps:

[0054] S1, pretreatment of valve body castings: the cast valve body castings are sequentially washed with water, washed with 10wt% hydrochloric acid, washed with water, and dried to obtain the pretreated valve body castings;

[0055] S2, the first surface treatment of the valve body casting: soak the pretreated valve body casting in the treatment agent for 5 minutes, remove and dry, and obtain the valve body casting after the first surface treatment.

[0056] The preparation method of treatment agent is as follows:

[0057] S1, pretreatment: Dissolve bis(dimercapto-1,3,4-thiadiazole) in acetone solution, filter with suction, evaporate the obtained filtrate to dryness under reduced pressure, dissolve it in 95wt% ethanol and recrystallize to remove acetone, Obtain pretreated bis(dimercapto-1,3,4-thiadiazole);

[0058] S2, in parts by weight, dissolve 5 parts o...

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Abstract

The invention relates to the field of valve body surface treatment, and particularly discloses a surface treatment process of a valve body casting part. According to the surface treatment process of the valve body casting part, the valve body casting part is obtained through pretreatment, first-time surface treatment and second-time surface treatment; a first-time surface treatment method comprises the steps that the pretreated valve body casting part is soaked in a treatment agent prepared from bis (dimercapto-1, 3, 4-thiadiazole), cerium trichloride, dimethylformamide and 95 wt% ethyl alcohol, and the valve body casting part is fished out and aired; and a second-time surface treatment method comprises the step of coating the surface of the valve body casting part subjected to the first-time surface treatment with a corrosion-resistant coating, wherein raw materials of the corrosion-resistant coating comprise epoxy resin, acrylic resin, ethyl cellulose, citric acid, acetonitrile, dibutyltin dilaurate and methyl cyclopentadienyl zirconium trichloride. The valve body casting part obtained through the surface treatment process has good corrosion resistance, the surface bonding strength of the corrosion-resistant coating on the surface of the valve body casting part is good, and the corrosion-resistant coating is not prone to falling off.

Description

technical field [0001] This application relates to the field of valve body surface treatment, more specifically, it relates to a surface treatment process of valve body castings. Background technique [0002] At present, the use of valves at home and abroad is becoming more and more extensive, and the requirements for valves are also getting higher and higher. The valve is usually composed of an opening and closing part (such as a ball in a ball valve) and a valve stem. The opening and closing part is driven by the valve stem to close or open the valve. [0003] The inner cavity of the valve is in the liquid for a long time, and it is impacted and corroded by the liquid. After the inner wall of the valve cavity is corroded, it is difficult to form a sealed state with the opening and closing parts, resulting in the failure of the ball valve. Therefore, its corrosion resistance needs to be improved. Contents of the invention [0004] In order to improve the corrosion resist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/02C09D163/00C09D133/04C09D101/28C09D5/08
CPCC23C22/02C09D163/00C09D133/04C09D5/08C08L33/04C08L1/28
Inventor 季豪敏季奇章
Owner WENZHOU WANHONG VALVE
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