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Metal pipeline nickel-based composite corrosion-resistant coating and preparation method thereof

A metal pipe and coating technology, which is applied in the direction of metal material coating process, coating, molten spraying, etc., can solve problems such as blistering, poor corrosion resistance of zinc spray coating, uneven corrosion, etc., and expand the scope of application , Improve the protective performance and excellent corrosion resistance

Inactive Publication Date: 2017-04-19
HANDAN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Second, in the normal atmospheric environment, the corrosion products of Zn coating are mainly composed of zinc oxide, basic zinc hydroxide and basic carbonate which are difficult to dissolve in water. Such corrosion products have a certain self-sealing ability to block moisture However, in an environment with a high content of chloride ions, due to the intrusion of chloride ions, corrosion products such as carbonates that are difficult to dissolve in water on the surface of the Zn coating are quickly replaced by loose and easily soluble chloride compounds. At the same time, the corrosion products will also cause blistering of the coating, reduce the adhesion of the coating, cause the coating to be prone to pitting corrosion, uneven corrosion and shorten its anti-corrosion life
[0005] Third, in the environment with low pH value (PH﹤4) and in the environment with high pH value (PH﹥12), the corrosion resistance of zinc spray coating is poor. Exceeding the potential of iron, the protective effect of the sacrificial anode is lost

Method used

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  • Metal pipeline nickel-based composite corrosion-resistant coating and preparation method thereof
  • Metal pipeline nickel-based composite corrosion-resistant coating and preparation method thereof
  • Metal pipeline nickel-based composite corrosion-resistant coating and preparation method thereof

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Effect test

Embodiment 1

[0021] The preparation method of this embodiment is as follows:

[0022] (1) Surface treatment of pipes: surface treatment of pipes and pipe fittings before thermal spraying to remove scale, oil, water, dust and any other impurities.

[0023] (2) Arc spraying nickel-based corrosion-resistant coating: select the arc thermal spraying equipment composed of high-power spraying power supply, spraying gun, wire feeding mechanism, air compressor, and control box. The ZnAl-coated Ni powder core wire with Ni50% is used as the metal wire for arc thermal spraying, according to 130g / m 2 Spray on the surface of the pipeline to form a nickel-based corrosion-resistant coating. The process parameters during spraying are shown in Table 1. The bonding force with the substrate is 26MPa, which is several times higher than that of the zinc layer of about 10MPa.

[0024] The coating arc spraying process parameter prepared by the embodiment 1 of table 1

[0025]

[0026] The prepared coating ha...

Embodiment 2

[0030] This implementation preparation method is as follows:

[0031] (1) Pipeline surface treatment: Before thermal spraying, the surface of the steel pipe is treated by shot blasting to remove scale, oil, water, dust and any other impurities.

[0032] (2) Arc spraying nickel-based corrosion-resistant coating: select the arc thermal spraying equipment composed of arc spraying equipment, spraying gun, wire feeding mechanism, air compressor, and control box, and the weight percentage of two φ3.0mm is Ni45% The ZnAl-coated Ni powder core wire is used as the metal wire for flame thermal spraying, according to 180g / m 2 Spray on the surface of the pipeline to form a nickel-based corrosion-resistant coating. The process parameters during spraying are shown in Table 2. The bonding force with the substrate is 30MPa, which is several times higher than the bonding force of the zinc layer of about 10MPa.

[0033] The coating arc spraying process parameter prepared by the embodiment 2 of...

Embodiment 3

[0039] This implementation preparation method is as follows:

[0040] (1) Pipeline surface treatment: Sandblast the surface of the pipe before thermal spraying to remove scale, oil, water, dust and any other impurities.

[0041](2) Arc spraying nickel-based corrosion-resistant coating: use arc thermal spraying equipment consisting of high-power spraying power supply, spraying gun, wire feeding mechanism, air compressor, and control box, and two φ2.0mm weight percent The Zn-coated Ni powder core wire with a content of Ni40% is used as a metal wire for arc thermal spraying, according to 400g / m 2 Spray on the surface of the pipeline to form a nickel-based corrosion-resistant coating. The process parameters during spraying are shown in Table 3. The bonding force with the substrate is 20MPa, which is more than 2 times higher than that of the zinc layer of about 10MPa.

[0042] The coating arc spraying process parameter that table 2 embodiment 3 prepares

[0043]

[0044]

...

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Abstract

The present invention relates to a metal pipeline nickel-based composite corrosion-resistant coating and a preparation method thereof, wherein the metal pipeline nickel-based composite corrosion-resistant coating comprises, by weight, 35-45% of Ni, 30-40% of Zn, 5-10% of Al, and the balance of the mixture of NiO, Ni2O3 and Al2O3. The method comprises: (1) pipeline surface treatment; (2) thermal spraying of a nickel-based corrosion-resistant coating; (3) coating if a pore sealing finish decoration layer, wherein the corrosion-resistant coating is subjected to pore sealing treatment by using spray coating, brush coating or roll coating, the typical spray coating method is high-pressure airless spray coating, and the coating thickness is 60-150 [mu]m; and (4) coating inspection, wherein the coating has characteristics of flat appearance, uniform color and same thickness, the thickness of the coating is detected by using a non-destructive detection instrument, and the pipe having the qualified thickness enters a finished product packaging process. According to the present invention, the prepared coating has advantages of strong bonding strength, good destructive resistance, high corrosion resistance, and the like.

Description

technical field [0001] The invention relates to a metal pipeline composite anti-corrosion coating and a preparation method thereof, in particular to a nickel-based anti-corrosion anti-corrosion coating and a preparation method thereof. Background technique [0002] At present, zinc (Zn) coating is the most widely used thermal spray coating for metal pipelines. Although Zn coating has good dynamic electrochemical protection performance, zinc coating has the following disadvantages: [0003] First, the high porosity of the Zn coating weakens its anti-corrosion performance; [0004] Second, in the normal atmospheric environment, the corrosion products of Zn coating are mainly composed of zinc oxide, basic zinc hydroxide and basic carbonate which are difficult to dissolve in water. Such corrosion products have a certain self-sealing ability to block moisture However, in an environment with a high content of chloride ions, due to the intrusion of chloride ions, corrosion product...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/12C23C4/129C23C4/06C22C30/06C22C32/00
CPCC23C4/12C22C30/06C22C32/001C23C4/06
Inventor 岳丹李丹花
Owner HANDAN COLLEGE