Method for evaluating protection capability of anti-corrosion cladding materials

A technology for coating materials and protecting performance, applied in the field of corrosion electrochemical research, can solve problems such as metal structure corrosion, moisture and chloride ion penetration

Inactive Publication Date: 2020-01-07
南通中国科学院海洋研究所海洋科学与技术研究发展中心 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, once the protective cover is affected by external force, affected by the aging of materials or partially damaged due to improper construction, etc., the protection of the metal structure only depends on materials such as anti-corrosion paste, and it is also easy to cause the risk of moisture and chloride ions infiltrating, causing metal damage. Localized corrosion of the structure
[0004] In the case of infiltration of moisture and chloride ions, the corrosion l

Method used

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  • Method for evaluating protection capability of anti-corrosion cladding materials
  • Method for evaluating protection capability of anti-corrosion cladding materials
  • Method for evaluating protection capability of anti-corrosion cladding materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The device includes a reaction pool, an electrode, a container, and an electric lifting platform; among them, holes are opened at the bottom of the side wall of the reaction pool and the container, and are connected through rubber hoses; the container is placed on the electric lifting platform, and the bracket for fixing the working electrode and the reference electrode are arranged in the reaction pool. , Auxiliary electrodes are inserted into the reaction pool, and each electrode is connected to the wire bundle electrode multi-channel tester through wires (see figure 1 and 2 ).

[0029] Specifically made as:

[0030] 1. Use the wire bundle electrode as the working electrode in the electrochemical experiment. Specifically, the present invention uses 10×10 steel wires (diameter 1 mm) densely arranged in rows and columns, and the horizontal and vertical linear distances between each steel wire are both 0.2 mm. After the arrangement is fixed, the acrylic resin is poure...

Embodiment 2

[0038] The following examples are long-term immersion experiments in 3.5%NaCl with 1018 low-carbon steel wire bundle electrodes as working electrodes:

[0039] The surface of the working electrode is coated with an anti-corrosion paste, see image 3 It is recorded that different regions correspond to different thicknesses, which are 0.5mm, 1mm and 1.5mm respectively; according to figure 1 It is recorded that the 1018 low-carbon steel wire bundle electrode coated with anti-corrosion paste is fixed on the bracket, so that the electrode surface is placed parallel to the 3.5% NaCl liquid surface in the reaction cell (see figure 2 A), the reference electrode is a saturated calomel electrode, and the auxiliary electrode is a metal platinum sheet. The area of ​​the platinum sheet is not less than twice the total cross-sectional area of ​​the steel wire. Each electrode can be connected to the wire beam electrode multi-channel tester. Monitor the change of open circuit potential (see...

Embodiment 3

[0041] Following embodiment is the experiment that carries out anodic polarization under 0.5V / SCE potential condition in the 3.5%NaCl that carries out as working electrode with 1018 low-carbon steel wire bundle electrodes:

[0042] A kind of anti-corrosion paste is coated on the surface of the working electrode, and a 0.5V / SCE potential is applied in a 3.5% NaCl solution to make the material in an anodic polarization state. Other experimental schemes are the same as in Example 2, and the current is monitored under anodic polarization conditions. Changes in density (see Figure 5 ). On the first day, the current density of each electrode was at 10 -6 A / cm 2 The order of magnitude is the passivation current of carbon steel material, which is in a protected state, and the metal and the solution are well isolated by the anti-corrosion paste. At 30 days, the 0.5mm thickness anti-corrosion paste coating area increased, and at 10 -5 A / cm 2 On the order of magnitude, while the 1m...

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Abstract

The invention relates to corrosion electrochemical investigation, in particular to a method for evaluating protection capability, for structural metallic materials, of anti-corrosion materials by utilizing a wire beam electrode. According to the method, anti-corrosion paste or an anti-corrosion band is coated or pasted on the surface of the wire beam electrode; the wire beam electrode is soaked inelectrolyte solution to serve as a working electrode; a three-electrode system is adopted to carry out electrochemical detection; and the anti-corrosion capability of the anti-corrosion materials isevaluated through monitoring the current density increase condition under the condition of open circuit potential negative shift or anodic polarization. According to the method, the wire beam electrode is used for researching the corrosion condition under the anti-corrosion paste/band, so that the change condition of electrochemical parameters can be monitored intuitionally, the parts with local corrosion initiation can be correctly positioned under the protection state of the anti-corrosion paste/band so as to discover the weak points, and important reference is provided for the constructionforms and component optimization of the cladding materials.

Description

technical field [0001] The invention relates to electrochemical research on corrosion, in particular to a method for evaluating the protective performance of anti-corrosion coating materials on metal structural materials by using wire bundle electrodes. Background technique [0002] Considering the impact of metal corrosion on the durability of materials, steel pile structure platforms built in oceans, lakes and rivers need anti-corrosion treatment. For parts such as tidal range areas and spray splash areas where the tide rises and falls, it is an effective method to use coating technology for corrosion protection. Coated or wound on the surface of the metal structure, and adding anti-corrosion agent and other substances, it can isolate the penetration of water and chloride ions to a certain extent, and inhibit the occurrence of corrosion. [0003] However, if the general cladding technology is applied in a long-term immersion environment, it still has the possibility of mo...

Claims

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Application Information

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IPC IPC(8): G01N17/02
CPCG01N17/02
Inventor 徐玮辰张斌斌翁德洋谢睿陈明忠侯保荣
Owner 南通中国科学院海洋研究所海洋科学与技术研究发展中心
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