Method and device for protecting metal surface from corroding and scaling

A technology for metal surfaces and metal parts, which is applied in the field of protecting metal surfaces from corrosion, scaling and devices, and can solve problems such as limited protection range, easy peeling off of the protective layer, and loss of protection.

Inactive Publication Date: 2008-01-16
杨木林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both the above-mentioned isolation method and cathodic protection method have defects. The protective layer of the isolation method is easy to fall off or when there are pinholes, it will lose its protective effect.
H

Method used

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  • Method and device for protecting metal surface from corroding and scaling
  • Method and device for protecting metal surface from corroding and scaling

Examples

Experimental program
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Effect test

Embodiment 1

[0022] In multiple identical pools [500mm×500mm×500mm], multiple metal parts 1 with the same steel pipe structure are placed respectively, with a length of 250mm, a diameter of 50mm, and a wall thickness of 3mm. The pools are filled with saturated salt water, and one of them does not take any measures. Two steel pipes are anti-corrosion by this method, the frequency of the AC power supply 2 connected to one of them is 2kHz, and the current density passing through the steel pipe is 2A / m 2 , the frequency of the other connected AC power supply 2 is 200Hz, and the current density through the steel pipe is 0.8A / m 2 , the frequency of another connected AC power supply 2 is 50Hz, and the current density through the steel pipe is 0.5A / m 2 , and the frequency of the connected AC power supply 2 is 1kHz, and the current density through the steel pipe is 1A / m 2 , the frequency of another connected AC power supply 2 is 4kHz, and the current density through the steel pipe is 10A / m 2 , th...

Embodiment 2

[0024] Inject water multiple times into two identical boiler containers, one of which does not take any measures, and the metal parts 1 of multiple boiler container structures adopt this method for anti-scaling, and the frequency of the AC power supply 2 connected to one of them is 2kHz, The current density through the boiler vessel is 2A / m 2 , the frequency of the other connected AC power supply 2 is 200Hz, and the current density passing through the boiler container is 0.8A / m 2 , the frequency of another connected AC power supply 2 is 50Hz, and the current density passing through the boiler container is 0.5A / m 2 , and the frequency of a connected AC power supply 2 is 1kHz, and the current density passing through the boiler container is 1A / m 2 , the frequency of another connected AC power supply 2 is 4kHz, and the current density passing through the boiler container is 10A / m 2 , the frequency of another connected AC power supply 2 is 3kHz, and the current density passing th...

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PUM

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Abstract

A method for protecting a metal surface against corrosion and scaling is provided, which comprises connecting individual two ends of a metal piece (1) to be protected with an AC power supply (2) and allowing the current density of the metal piece at least 0.5A/m<2>. An apparatus for implementing the method comprises an oscillator, a driver circuit and an inverter, wherein the signals from oscillator are input to the driver circuit and the driver circuit drives the inverter. Under the skin effect of high-frequency current in the metal piece, a large quantity of free electrons are concentrated on the surface of the metal piece, and the electrons have negative charges and repulse oxidative anions, thereby providing anti-corrosive and anti-scaling effects. The method is suitable for the corrosion and scaling protection of ship, offshore oil-drilling platform, oil and chemical pipeline, metal container and equipment, boiler, air conditioner, engine and bridge. The invention aims to provide a method protecting a metal surface against corrosion and scaling without reconstructing the existing equipment and structure and superior in low cost, wide protection range, uniform protection and good protective effect.

Description

technical field [0001] The invention relates to a method and a device for protecting a metal surface from being corroded and scaled. Background technique [0002] Corrosion of metal materials will cause serious damage to related equipment. At present, the following two methods are often used for metal anticorrosion: one is the isolation method: the metal material is isolated from the corrosive medium such as water, soil, air, etc. for anticorrosion. Such methods include spraying paint, winding tape, lining plastic, etc. The other is the cathodic protection method: the metal material is used as the cathode, and an anode is added, and an electric field is applied between the anode and the metal material by a DC power supply, and the metal material of the cathode is protected from corrosion by corroding the anode. Both the above-mentioned isolation method and the cathodic protection method have defects, and the protective layer of the isolation method is easy to fall off or wi...

Claims

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Application Information

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IPC IPC(8): C23F15/00
Inventor 杨木林
Owner 杨木林
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