A treatment method for corrosion-resistant cross-hanger hardware

Abstract

The application belongs to the technical field of electric power fittings, and relates to a treatment method of a corrosion-resistant cross hanging plate fitting. The treatment method comprises the steps of steel plate stamping, drilling, cleaning, spraying of alcohol-soluble inorganic zinc silicate primer, cold zinc spraying and closed passivation, so as to form a fine composite zinc protective layer. The treatment method has the advantages of small consumption of heat energy, cost saving, provision of cathodic protection and barrier protection, good corrosion prevention effect, long service life, saving of funds, bright zinc plating layer surface, strong metal feeling, high hardness and long corrosion prevention life. The closed passivation further improves the corrosion resistance of the cross hanging plate fitting, and has the advantages of stable passivation liquid, good film adhesion and good corrosion resistance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric power fittings, and particularly relates to a treatment method of corrosion-resistant cross hanging plate fittings. BACKGROUND

[0002] The cross hanging plate is a special hanging plate for installing a voltage-sharing shielding ring on a single-link tension or suspension insulator string. The cross hanging plate fitting is mostly made of galvanized steel material, and the voltage-sharing shielding ring and the cross hanging plate fitting are mostly exposed to an outdoor open environment, but the fitting is usually movable and generally in a tensile stress state, and is prone to corrosion damage in the operation process due to impact, friction, acid corrosion and the like. CN201911184954.1 discloses a method for preventing corrosion of an electric power fitting, which comprises the following steps: heating a metal to above a melting point to obtain a liquid metal; and immersing the electric power fitting in the liquid metal. The hot-dip galvanizing process needs to be subjected to pickling and water washing, and a large amount of acid gas is generated, which seriously pollutes the atmospheric environment. The thickness of the hot-dip galvanizing coating may be uneven, and the thick coating is prone to falling off, which may cause local rust, reduce the performance of parts, and even cause accidents. Therefore, there is an urgent need for a treatment method of corrosion-resistant cross hanging plate fittings. SUMMARY

[0003] In view of the above problems, the application aims to provide a treatment method of corrosion-resistant cross hanging plate fittings.

[0004] The application is achieved by the following technical scheme:

[0005] The treatment method of the corrosion-resistant cross hanging plate fitting comprises the following steps: first, spraying an alcohol-soluble inorganic zinc silicate primer: spraying the alcohol-soluble inorganic zinc silicate primer, and air-drying for 6-8 hours to obtain a sprayed primer cross hanging plate fitting; second, cold spraying zinc: cold spraying zinc coating on the surface of the sprayed primer cross hanging plate fitting, wherein the spraying pressure is 11-14 MPa, the nozzle aperture is 0.5-0.6 mm, the distance between the nozzle and the cross hanging plate fitting is 150-200 mm, and the spraying is performed for 1-2 times to obtain a cold-sprayed zinc cross hanging plate fitting.

[0006] The cross hanging plate is a special hanging plate for installing a voltage-sharing shielding ring on a single-link tension or suspension insulator string.

[0007] The cold zinc coating has poor solvent resistance. The cold zinc passivation sealing can effectively improve the corrosion resistance of the cold-sprayed zinc.

[0008] Third step, passivation sealing: the cold zinc cross hanging plate hardware is put into the passivation sealing liquid, the pH value is adjusted to 2.5-2.8, the passivation temperature is 35-38 DEG C, and the immersion passivation is 20-30s, and then the hardware is taken out, washed and air-dried.

[0009] The cold zinc is also called cold-coated zinc or cold galvanizing in the anticorrosion industry.

[0010] Further, the first step alcohol-soluble inorganic zinc silicate primer is an ethyl silicate type alcohol-soluble inorganic zinc silicate primer, which is prepared by using ethyl silicate as a base material and zinc powder as a component, and is preferably E0623 or E0621.

[0011] The alcohol-soluble inorganic zinc silicate coating is prepared by using an ethyl silicate pre-hydrolysis solution as a base material and zinc powder.

[0012] Further, the spraying thickness of the first step cross hanging plate hardware is 20-25 microns.

[0013] The cross hanging plate is a special hanging plate for installing a voltage-sharing shielding ring on a single-link tension or suspension insulator string.

[0014] Further, the spraying thickness of the first step cold zinc cross hanging plate hardware is 70-80 microns.

[0015] Further, the second step cold zinc coating is one of JP1618 or SX960.

[0016] Further, the third step passivation sealing liquid is a solution obtained by mixing a trivalent chromium passivation agent with water, and the trivalent chromium ion content is 0.5-0.7g / L.

[0017] The passivation sealing is a one-step treatment method, which uses a passivation liquid containing a water-soluble sealing component, and the passivation and sealing treatment are completed in the same tank liquid.

[0018] The application discloses a treatment method of a corrosion-resistant cross hanging plate hardware. Specific embodiments

[0019] The application is described in detail below with specific embodiments, but is not limited to the application. Example 1

[0020] Raw materials: cold-sprayed zinc coating of Jinshan JP1618, trivalent chromium passivator of Dongfang Surface P-Z12, ethyl silicate alcohol-soluble inorganic zinc silicate primer of E0623, steel plate Q345. Spray gun of Ruifeng Wufu. High-pressure airless sprayer 759E.

[0021] The treatment method of corrosion-resistant cross-hanger hardware includes conventional steel plate stamping, drilling, cleaning, surface leveling, smoothness, edge without burr, and removal of quality-affected spots, pits, scratches and other defects. The surface is cleaned of dirt, rust, welding slag and oxide layer. The pre-plating treatment meets the relevant provisions of GB / T13912-2002 Appendix C. In addition to the steps of obtaining the cross-hanger hardware, the following steps are included: first step, spray alcohol-soluble inorganic zinc silicate primer: spray gun RF703S, nozzle 1.7mm, working pressure 0.3MPa, coating flow 220mL / min, spray length 180mm, spray width 40mm, spray distance 200mm, spray alcohol-soluble inorganic zinc silicate primer, spray thickness 20μm, outlet air pressure 100kg / cm 2 , air dry for 6h to obtain a spray primer cross-hanger hardware; second step, cold-sprayed zinc: high-pressure airless sprayer sprays zinc coating on the surface of the spray primer cross-hanger hardware, with a spraying pressure of 11MPa, nozzle diameter of 0.5mm, distance between nozzle and cross-hanger hardware of 150mm, 1 spraying, spraying thickness of 70μm, and cold-sprayed zinc cross-hanger hardware obtained after spraying; third step, passivation sealing: place the cold-sprayed zinc cross-hanger hardware in the passivation sealing liquid, adjust the pH value to 2.5, passivation temperature to 35℃, and soak for 20s. The passivation sealing liquid is a solution obtained by mixing trivalent chromium passivator and water, with a trivalent chromium ion content of 0.5g / L. After taking out, wash and air dry.

[0022] Product: smooth surface, no cracks, lamination, peeling, shrinkage, acid return, zinc slag, zinc thorn and other defects, zinc layer firmly and uniformly adhered to the cross-hanger hardware, no peeling and peeling phenomenon, copper sulfate test, corrosion resistance 5 times, and no iron exposed. Example

[0023] Raw materials: cold-sprayed zinc coating of Jinshan JP1618, trivalent chromium passivator of Dongfang Surface P-Z12, ethyl silicate alcohol-soluble inorganic zinc silicate primer of E0623, steel plate Q345. High-pressure airless sprayer 759E.

[0024] The treatment method of the corrosion-resistant cross-hanger hardware includes the steps of conventional steel plate punching, drilling, cleaning, surface leveling, smoothness, edge burr, no quality affecting spots, pits, scratches and other defects, removing surface dirt, rust, welding slag and oxide layer and other excesses, and pre-plating treatment in accordance with the relevant provisions of GB / T13912-2002 Appendix C. In addition to the steps of obtaining the cross-hanger hardware, the following steps are also included: first step, spraying alcohol-soluble inorganic zinc silicate primer: spray gun RF703S, nozzle 1.4mm, working pressure 0.3MPa, coating flow 210mL / min, spraying length 260mm, spraying width 70mm, spraying distance 200mm, spraying alcohol-soluble inorganic zinc silicate primer, spraying thickness 22μm, outlet air pressure 110kg / cm 2 , air drying for 7h to obtain a sprayed primer cross-hanger hardware; second step, cold zinc spraying: cold zinc spraying coating on the surface of the sprayed primer cross-hanger hardware, wherein the spraying pressure is 12MPa, the nozzle aperture is 0.5mm, the distance between the nozzle and the cross-hanger hardware is 150mm, spraying is performed for 2 times, the spraying thickness is 75μm, and the cold zinc-sprayed cross-hanger hardware is obtained after spraying is completed; third step, passivation sealing: placing the cold zinc-sprayed cross-hanger hardware into a passivation sealing liquid to adjust the pH value to 2.6, passivation temperature is 36℃, soaking passivation for 25s, the passivation sealing liquid is a solution obtained by mixing trivalent chromium passivator and water, the trivalent chromium ion content of the solution is 0.6g / L, and then washing and air drying.

[0025] Product: smooth surface, no cracks, lamination, peeling, shrinkage, acid return, zinc slag, zinc thorn and other defects, zinc layer firmly and uniformly adheres to the cross-hanger hardware, no peeling and peeling phenomenon, copper sulfate test is performed, the corrosion resistance number is 5 times, and no iron is exposed. Example 3

[0026] Raw materials: ZD96-1 cold zinc spraying coating, Gaoxin SL-85 trivalent chromium passivator, ZD700 ethyl silicate alcohol-soluble inorganic zinc silicate primer, steel plate Q345, high-pressure airless sprayer 759E.

[0027] The treatment method of the corrosion-resistant cross-hanger hardware includes the steps of conventional steel plate punching, drilling, cleaning, surface leveling, smoothness, edge burr, no quality affecting spots, pits, scratches and other defects, removing surface dirt, rust, welding slag and oxide layer and other excesses, and pre-plating treatment in accordance with the relevant provisions of GB / T13912-2002 Appendix C. In addition to the steps of obtaining the cross-hanger hardware, the following steps are also included: first step, spraying alcohol-soluble inorganic zinc silicate primer: spraying alcohol-soluble inorganic zinc silicate primer, spraying thickness 25μm, outlet air pressure 120kg / cm 2, air-dried 8h to obtain the cross-hanger fitting coated with the primer; in the second step, cold spraying of zinc: the high-pressure airless sprayer was used to spray the zinc coating on the surface of the cross-hanger fitting coated with the primer, wherein the spraying pressure was 14MPa, the nozzle aperture was 0.6mm, the distance between the nozzle and the cross-hanger fitting was 200mm, 2coats were sprayed, the spraying thickness was 80μm, and the cross-hanger fitting coated with the cold-sprayed zinc was obtained; in the third step, passivation and sealing: the cross-hanger fitting coated with the cold-sprayed zinc was put into the passivation and sealing solution, the pH value was adjusted to 2.8, the passivation temperature was 38℃, the cross-hanger fitting was soaked in the passivation solution for 30s, the passivation and sealing solution was a solution containing 0.7g / L of trivalent chromium ions obtained by mixing trivalent chromium passivator and water, and the cross-hanger fitting was taken out and washed and air-dried.

[0028] Product: the surface is smooth, and free of defects such as cracks, lamination, peeling, shrinkage, acid return, zinc slag and zinc burrs; the zinc layer is firmly and uniformly adhered to the cross-hanger fitting without peeling and peeling phenomenon; the copper sulfate test is passed, the number of corrosion resistance is 5 times, and no iron is exposed.

[0029]

[0030] Note: refer to DL / T 759-2009 connecting fittings; DL / T 768.7-2012 quality of steel fittings for manufacturing galvanized layer. The adhesion test method refers to GB / T 13912-2002 Appendix C.6. The uniformity test method refers to DL / T 768.7-2012 Appendix A.

Claims

1. A method of treating corrosion-resistant cross-arm hardware, comprising the steps of conventional steel sheet stamping, drilling, and cleaning the cross-arm hardware, characterized by, Further comprising the following steps: The first step, spraying alcohol-soluble inorganic zinc silicate primer: spraying alcohol-soluble inorganic zinc silicate primer, and air-drying for 6-8 hours to obtain a sprayed primer cross-hanger fitting; the second step, cold spraying zinc: cold spraying zinc coating on the surface of the sprayed primer cross-hanger fitting, wherein the spraying pressure is 11-14 MPa, the nozzle aperture is 0.5-0.6 mm, the distance between the nozzle and the cross-hanger fitting is 150-200 mm, spraying is performed for 1-2 times, and a cold-sprayed zinc cross-hanger fitting is obtained after spraying; the third step, passivation sealing: placing the cold-sprayed zinc cross-hanger fitting into a passivation sealing liquid, adjusting the pH value to 2.5-2.8, passivating at a temperature of 35-38 ℃ for 20-30 seconds, taking out, washing, and air-drying; the spraying thickness of the cold-sprayed zinc cross-hanger fitting in the second step is 70-80 μm; and the passivation sealing liquid in the third step is a solution obtained by mixing trivalent chromium passivator with water, and the content of trivalent chromium ions in the solution is 0.5-0.7 g / L.

2. The method of claim 1, wherein the corrosion-resistant crossarm fitting is made of a material selected from the group consisting of aluminum, aluminum alloy, zinc, zinc alloy, and combinations thereof. The alcohol-soluble inorganic zinc silicate primer in the first step is an ethyl silicate type alcohol-soluble inorganic zinc silicate primer.

3. The method of claim 1, wherein the corrosion-resistant crossarm fitting is made of a material selected from the group consisting of aluminum, aluminum alloy, zinc, zinc alloy, and combinations thereof. The spraying thickness of the sprayed primer cross-hanger fitting in the first step is 20-25 μm.

4. The method of claim 1, wherein the corrosion-resistant crossarm fitting is made of a material selected from the group consisting of aluminum, aluminum alloy, zinc, zinc alloy, and combinations thereof. The cold-sprayed zinc coating in the second step is one of JP1618 or SX960.

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