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Anti-chlorine ion corrosion Ni-Cr nano composite coating and preparing method and use

A technology of ion corrosion and nano-composite, applied in the direction of coating, electrolytic coating, etc., to achieve the effect of uniform composition, low porosity and good resistance to Cl ion corrosion

Inactive Publication Date: 2006-06-07
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention adopts the method for co-electrodeposition of metal-nanometer metal particles to prepare a composite coating resistant to Cl ion corrosion, which has not been reported yet

Method used

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  • Anti-chlorine ion corrosion Ni-Cr nano composite coating and preparing method and use
  • Anti-chlorine ion corrosion Ni-Cr nano composite coating and preparing method and use
  • Anti-chlorine ion corrosion Ni-Cr nano composite coating and preparing method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The preparation method of the Ni-Cr nanocomposite coating is prepared by conventional co-electrodeposition technology, and its process is as follows:

[0041]Substrate metal Ni-surface grinding to 800# water sandpaper-surface ultrasonic cleaning-co-electrodeposition in Ni plating bath containing nano-Cr powder-obtain Ni-Cr nanocomposite coating. The key to the preparation of the nano-coating layer of the present invention is to keep the nano-particles suspended in the bath liquid during electroplating, while having good dispersion performance. The preparation steps of the present invention are specifically as follows:

[0042] Take an electrolytic Ni plate with a purity of 99.96% as the base material, process it into a small sample with a size of 15×10×2mm, and grind it to 800 # , ultrasonic cleaning in acetone;

[0043] Get the nano-Cr powder (prepared by Beijing Zhongkangda Nano Technology Co., Ltd.) with a particle size in the range of 10nm-80nm and an average part...

Embodiment 2

[0048] This example compares the corrosion resistance of Ni-Cr nanocomposite coatings (ENNC: Electrodeposited nanoparticle-dispersed nanocomposite coating) with different Cr contents.

[0049] Using the M273 potentiostat and PAR M352 electrochemical test system produced by EG&G Company, the single Ni coating (ENNC Ni-0Cr), ENNC Ni-4.5Cr and ENNC Ni-10.9Cr (mass percentage, the same below) were electro-conducted, respectively. Chemical corrosion performance test. The experiment adopts a standard three-electrode system: the sample is the working electrode (WE), the platinum sheet is the auxiliary electrode (AE), and the saturated calomel electrode (SCE) is the reference electrode (RE). All potentials are based on it. The experimental data is automatically recorded under the monitoring of the microcomputer, and the software equipped with the M352 system is used for curve fitting and kinetic parameter processing. The experimental temperature is room temperature, and the corrosion...

Embodiment 3

[0051] This example compares the corrosion resistance of ENNC Ni-Cr and Ni-Cr coating of composite micron-sized particles (EMCC: Electrodeposited microparticle-dispersed composite coating).

[0052] In order to further study the corrosion resistance of ENNC, the potentiodynamic polarization curves and constant potential I-t curves of ENNC Ni-10.9Cr and EMCC Ni-12.4Cr were tested respectively by using the same equipment, the same parameters and the standard three-electrode system. Figure 7 It is the test result of potentiodynamic polarization curve. It can be seen that in the case of similar Cr content, the pitting breakdown potential and passivation range of ENNC Ni-10.9Cr is greater than that of EMCC Ni-12.4Cr (Table 2), so the pitting corrosion resistance of ENNC Ni-10.9C is better than that of EMCC Ni-12.4Cr. Figure 8 It is the I-t curve of the two coatings in the passivation interval (E=-0.1V). It can be seen that the anode current density of the ENNNCi-10.9Cr passivat...

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Abstract

The present invention discloses a kind of chlorine ion corrosion resisting nanometer composite Ni-Cr coating and its preparation and application. The nanometer composite Ni-Cr coating is prepared with nanometer metal Ni and Cr powder with Cr content of 4-15 wt%. The preparation process of the nanometer composite Ni-Cr coating is to electroplate Ni and Cr onto Ni substrate through conventional electric co-deposition. The nanometer composite Ni-Cr coating has obviously higher corrosion resistance than NiCr alloy with similar Cr content and composite Ni-Cr coating with micron Cr grains in similar content. The present invention has simple technological process, low cost, and compact and homogeneous coating. The nanometer composite Ni-Cr coating, when set in water solution containing Cl ion, will form hydrated Cr containing oxide and hydroxide to resist corrosion of Cl ion.

Description

technical field [0001] The invention relates to a coating technology, in particular to a metal-based (Ni-Cr) nanocomposite coating of dispersed Cr nanoparticles resistant to corrosion by Cl ions, a preparation method and an application. Background technique [0002] The metal materials used in the medium containing Cl ions (for example: for offshore ships, submarines, oil drilling facilities and other related materials) need to have good resistance to Cl ion corrosion. Generally, most service steels (such as carbon steel and low-alloy steel) cannot form a stable and complete protective Cr hydration passivation film because they do not contain Cr or have low Cr content, so their corrosion resistance to Cl ions is not ideal. According to literature reports, for ferritic or austenitic stainless steel, the Cr content required to form a protective Cr hydrated passivation film is greater than 20% (mass percentage), and its required content is greater than most commonly used ferrit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D15/00
Inventor 彭晓张艳王福会
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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