Preparation method of corrosion-resistant conductive grounding carbon steel in-situ coating

A carbon steel, in-situ technology, applied in the direction of contact manufacturing, connecting contact materials, etc., can solve the problems of uneven coating, poor adhesion of external coating, and continuous consumption of resources by cathodic protection technology. Reduce corrosion rate, avoid long-term consumption and maintenance effect

Pending Publication Date: 2021-08-20

ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO +2

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Problems solved by technology

However, the above-mentioned technologies have the following defects: cathodic protection technology has the disadvantage of continuous consumption of resources; ...

Abstract

The invention relates to a preparation method of a corrosion-resistant grounding carbon steel in-situ coating. The preparation method comprises the following steps of (1) pretreating the surface of carbon steel, (2) placing the treated carbon steel serving as an anode and a graphite plate serving as a cathode in an in-situ electrolyte, and carrying out electrolytic treatment for a certain time, and (3) putting the carbon steel treated in the step (2) into in-situ post-treatment liquid, and stopping post-treatment for a certain time. The method disclosed by the invention overcomes the defects that an external coating is poor in adhesive force and easy to fall off. Meanwhile, the problems of long-term consumption and maintenance of an electrochemical protection technology are avoided. On the basis of ensuring the conductive drainage of the carbon steel material, the corrosion form is controlled to be uniform corrosion, the corrosion rate of the carbon steel material in soil is greatly reduced, and finally, the grounding carbon steel meets the service cycle of design requirements.

Application Domain

Contact member manufacturingConnection contact member material

Technology Topic

Carbon steelElectrically conductive +8

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Experimental program(4)
Comparison scheme(3)

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[0024] Example 1

[0025] Method for preparing a corrosion resistant grounding carbon steel in situ coating, including the following steps:

[0026] (1) Surface pretreatment of carbon steel: After wiping the carbon steel, the sandpaper is carried out under 100 # silicon carbide sandpaper to grind 10min;

[0027] (2) The treated carbon steel is used as an anode, the graphite plate is used as the cathode, and the carbon steel surface area and the graphite surface area ratio are 1:20. Placed in the inner electrolyte, the electrolytic solution temperature is controlled at 40 ° C, the stirring speed is 300 r / min, and the set parameters of the DC power supply are current 0.5a, the frequency is 50Hz, and the power supply is turned on, and the processing is 30 min

[0028] Electrolytic treatment has a certain period of time, the components and content of the in situ treatment liquid: 5 g / L sodium aluminate, 5g / L hexaphyphosphate, 3 g / L sodium carbonate, 10mL / L polyaniline, 10ml / L Polypyrrole, 10 ml / L Polyphenyl acetylene, 10 g / L ortho vanadate, 2g / L sulfate, 10g / L fluoride, a total of 5L is treated;

[0029] (3) Place the carbon steel processed after step (2) in the inner post treatment liquid, the post-treatment liquid is 10 mL / L polyurea, 10 ml / L Polyaniline, 5g / L, sodium dihydrogen, 2g / L sodium hydroxide. 50 ° C was stopped after 60min under heating conditions.

[0030] The conductive coating is obtained, and then the corrosion potential of the coating is tested, the corrosion rate is obtained, and the test results are listed in Table 1.

Example Embodiment

[0031] Example 2

[0032] The method of the first Example 1 was repeated as specified in Table 1 below, and the test results were listed in Table 1.

Example Embodiment

[0033] Example 3

[0034] The method of the first Example 1 was repeated as specified in Table 1 below, and the test results were listed in Table 1.

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Classification and recommendation of technical efficacy words

reduce corrosion rate

Preparation method of corrosion-resistant conductive grounding carbon steel in-situ coating

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Description & Claims & Application Information

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