A kind of reduced graphene oxide-nickel base gradient coating and preparation method thereof

A graphene and gradient technology is applied in the field of reduced graphene oxide-nickel-based gradient coating and its preparation, and can solve the problems that the corrosion resistance of the coating needs to be improved.

Active Publication Date: 2020-04-28
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the corrosion resistance of the coating in the prior art still needs to be improved

Method used

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  • A kind of reduced graphene oxide-nickel base gradient coating and preparation method thereof
  • A kind of reduced graphene oxide-nickel base gradient coating and preparation method thereof
  • A kind of reduced graphene oxide-nickel base gradient coating and preparation method thereof

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preparation example Construction

[0050] The invention provides a kind of preparation method of reduced graphene oxide-nickel base gradient coating, comprises the following steps:

[0051] Provide a plating solution, including graphene oxide in the plating solution;

[0052] Using the nickel plate as the anode and the metal substrate to be plated as the cathode, using the plating solution for electroplating, forming a reduced graphene oxide-nickel-based gradient coating on the metal substrate to be plated;

[0053] Wherein, the electroplating includes the first electroplating, the second electroplating and the third electroplating performed in sequence; the duty ratio of the first electroplating is 0.70-0.85, the duty ratio of the second electroplating is 0.55-0.60, and the duty ratio of the third electroplating is 0.70-0.85. The duty cycle is 0.20 ~ 0.40.

[0054] The invention provides a plating solution, which includes graphene oxide. In the present invention, the concentration of graphene oxide in the pl...

Embodiment 1

[0073] Pretreatment of the carbon steel test piece (20# steel, 50mm×25mm×2mm in size): use 150-2000# sandpaper to polish the surface of the carbon steel test piece step by step, and then use a polishing paste with a particle size of W3.5 Polish to the mirror surface and connect the wires; use silica gel to encapsulate the wires and the back of the carbon steel test piece, then use lye to clean and degrease the carbon steel test piece, and use acid to activate and derust the carbon steel test piece;

[0074] Preparation of plating solution: the composition and content of the plating solution are shown in Table 1;

[0075] The composition and content of the plating solution in Table 1

[0076]

[0077] Electroplating the pretreated carbon steel test piece: quickly put the pretreated carbon steel test piece into the constant temperature plating solution, connect the nickel plate (anode) to the anode of the pulse power supply, and put the carbon steel test piece (cathode) Conn...

experiment example 1

[0092] Use a magnetically driven reactor with a volume of 3L produced by Dalian Kemao Experimental Equipment Co., Ltd. to simulate CO 2 The coupon test in the saturated NaCl solution environment (hereinafter referred to as the first simulation environment), specifically the carbon steel test piece containing the gradient coating prepared in Example 1 is soaked in the NaCl solution of 3.5wt% (using the reactor fixture Fix the carbon steel test piece containing the gradient coating), the test temperature is 25°C, keep the exhaust valve of the reaction kettle fully open, make the inside of the reaction kettle under normal pressure conditions, and feed into the NaCl solution in the reaction kettle High-purity CO 2 (purity is 99.999%), until the pH value of NaCl solution does not change, promptly reaches saturated state, carry out hanging test (in the NaCl solution, continuously feed high-purity CO 2 , in order to maintain its saturated state, the duration of the experiment is 6h,...

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Abstract

The invention relates to the technical field of surface protection, in particular to reduced graphene oxide and nickel base gradient plating, and a preparation method thereof. The preparation method comprises the following steps of providing a plating solution, wherein the plating solution comprises reduced graphene oxide; using a nickel plate as an anode, using a metal substrate to be plated as acathode, and using the plating solution to carry out electroplating so as to form the reduced graphene oxide and nickel base gradient plating on the metal substrate to be plated, wherein electroplating includes first electroplating, second electroplating and third electroplating, the duty ratio of the first electroplating ranges from 0.70 to 0.85, the duty ratio of the second electroplating ranges from 0.55 to 0.60, and the duty ratio of the third electroplating ranges from 0.20 to 0.40. According to the reduced graphene oxide and nickel base gradient plating, and the preparation method thereof, the reduced graphene oxide is added into the plating solution, a functional gradient electroplating technology is adopted, and the reduced graphene oxide is contained in the obtained gradient plating so that the capacity of the plating for resisting invasion of corrosive materials can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of surface protection, in particular to a reduced graphene oxide-nickel-based gradient coating and a preparation method thereof. Background technique [0002] CO 2 Corrosion is one of the severe corrosions often encountered in the oil and gas industry, CO 2 Corrosion seriously threatens safe production and may cause catastrophic accidents. in CO 2 In a corrosive environment, CO 2 Dissolve in water to form carbonic acid (H 2 CO 3 ) and change the pH value of the solution, part of the carbonic acid is dissociated into H + 、HCO 3- and CO 3 2- ion. The overall response is: [0003] [0004] Carbon steel is often used as a pipe in the oil and gas industry. In order to solve the corrosion problem of carbon steel, reduce losses and increase profits, the most direct and effective method is to add a layer of coating on its surface to prevent corrosive substances from contacting it. However, the corrosi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D15/00C25D5/14C25D5/18
CPCC25D5/14C25D5/18C25D15/00
Inventor 崔淦张瑞宇毕真啸李自力刘建国邢潇张楚楚邓翔元
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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