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Electrolytic spray cleaning process for large metal workpiece

A metal workpiece and large-scale technology, which is applied in the field of electrolytic spray cleaning of large-scale metal workpieces, can solve the problems of inconvenient operation and easy environmental pollution.

Inactive Publication Date: 2012-10-17
孔庆山
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides an electrolytic spray cleaning process for large metal workpieces, aiming to solve the problems of inconvenient operation and easy pollution of the environment in the existing spray cleaning method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: A kind of electrolytic spray cleaning process of large metal workpiece, mainly consists of the following steps:

[0030] The first step: use a stainless steel distillation tower (large metal workpiece) as an electrode, and a nozzle as a counter electrode. The nozzle has a three-layer structure, and the outer layer is conductive metal copper, which is electrically connected to the stainless steel distillation tower. It is an insulating material, and the inner layer is an ordinary anti-corrosion polymer material water pipe. The voltage between the electrode and the counter electrode is 10-20 volts, and the current density is 20-30A / dm 2 . The structure of the nozzle can also be two-layer, the outer layer is conductive metal copper, and the inner layer is a polymer material water pipe.

[0031] Step 2: The electrolyte is sprayed onto the surface of the large metal workpiece through the nozzle, and the large metal workpiece is cleaned under the action of an ...

Embodiment 2

[0035] Embodiment 2: a kind of large-scale metal workpiece electrolytic spray cleaning process, a kind of large-scale metal workpiece electrolytic spray cleaning process, mainly consists of the following steps:

[0036] The first step: use the stainless steel reaction kettle (large metal workpiece) as an electrode, set a pair of electrodes in the spray area of ​​a nozzle, and the material of the counter electrode is graphite, so that the counter electrode and the nozzle ejected The liquid is in contact; the voltage between the electrode and the counter electrode is 15 volts, and the current density is 45A / dm 2 .

[0037] Step 2: The electrolyte is sprayed onto the surface of the large metal workpiece through the nozzle, and the large metal workpiece is cleaned under the action of an electric field; the electrolyte is a neutral electrolyte; the neutral The formula of the electrolyte solution is: every 1 liter of solution contains 120 grams of sodium persulfate, 20 grams of sod...

Embodiment 3

[0041] Embodiment three: a kind of large-scale metal workpiece electrolytic spray cleaning process, mainly consists of the following steps:

[0042] The first step: use an iron boiler (large metal workpiece) as an electrode, set a pair of electrodes in the liquid spray area of ​​a nozzle, and the material of the opposite electrode is nickel, so that the opposite electrode and the nozzle ejected The liquid is in contact; the voltage between the electrode and the counter electrode is 18 volts, and the current density is 20A / dm 2 .

[0043] Step 2: The electrolyte is sprayed onto the surface of the large metal workpiece through the nozzle, and the large metal workpiece is cleaned under the action of an electric field; the electrolyte is an acidic electrolyte; the acidic electrolyte The formula is: every 1 liter of solution contains 75 grams of oxalic acid, 20 milliliters of hydrogen peroxide, 3 grams of urea, 2.5 grams of naphthalenesulfonic acid-formaldehyde condensate, and the...

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Abstract

The invention discloses an electrolytic spray cleaning process for a large metal workpiece, which mainly comprises the following steps: 1, setting a large metal workpiece as an electrode and setting a spray nozzle as a counter electrode, or setting the large workpiece as an electrode and placing a counter electrode in the liquid spray area of a spray nozzle and contacting the counter electrode with the liquid sprayed out from the spray nozzle; 2, spraying electrolyte onto the surface of a large metal workpiece from the spray nozzle, and cleaning the large metal workpiece under the action of an electric field, wherein the electrolyte is alkaline, neutral or acidic electrolyte; 3, blowing off the electrolyte on the surface of the large metal workpiece by using air; 4, spraying water or deionized water onto the large workpiece to wash the large workpiece; and 5, drying the large metal workpiece by using high-pressure vapor. In the invention, the process is simple and the cleaning speed is high.

Description

technical field [0001] The invention relates to an electrolytic spray cleaning process for large metal workpieces, in particular to a process for electrolytic spray cleaning the surfaces of workpieces such as large towers such as rectifying towers and reactors such as reactors used in the chemical industry. Background technique [0002] The chemical industry usually uses towers such as distillation towers, absorption towers, recovery towers, washing towers and cooling towers, reactors such as reactors, containers such as boilers and storage tanks, and heat exchange equipment such as heat exchangers. These equipment are usually Made of metal materials such as stainless steel, it is difficult to carry due to its huge size. The outer surfaces of these large metal workpieces used in the chemical industry usually have oil stains, welding spots, and rust spots. The existing technology generally uses a high-pressure spray gun to remove the surface solution of the large metal workpi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F1/04C25F7/00
Inventor 孔庆山
Owner 孔庆山