Preparation method of low-cost high-corrosion-resistance Monel metal coating

An alloy coating and corrosion-resistant technology, applied in the field of preparing Monel alloy coating, can solve the problem of high cost and achieve the effects of low cost, reduced self-corrosion current density and excellent corrosion resistance.

Inactive Publication Date: 2015-05-27
HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the entire workpiece is completely made of Monel alloy, and the cost is relatively high

Method used

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  • Preparation method of low-cost high-corrosion-resistance Monel metal coating
  • Preparation method of low-cost high-corrosion-resistance Monel metal coating
  • Preparation method of low-cost high-corrosion-resistance Monel metal coating

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Experimental program
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Effect test

specific Embodiment approach 1

[0016] Embodiment 1: In this embodiment, the preparation method of Monel alloy coating on the surface of steel with low cost and high corrosion resistance is realized according to the following steps: 1. The steel surface is subjected to mechanical pretreatment. Roughly grind the steel surface with 800# sandpaper, then scrub with acetone to remove oil and rust. 2. Pre-treat the steel surface before plating. (1) The test piece is connected to a positive voltage of 10-20V, and the surface is brushed with an electric cleaning solution (alkaline) for 10-30s, and then rinsed with water; (2) The test piece is connected to a reverse voltage. Connect to 10-20V, brush the surface with No. 2 activation solution (acid) for 10-30s, and then rinse with water; (3) The test piece is connected to the voltage reversely connected to 10-20V, and the surface is brushed with No. 3 activation solution (acid) for 10-30s, Rinse with water. 3. Conduct electric brush plating on the surface of the work...

specific Embodiment approach 2

[0034] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 4, a high-temperature heat treatment furnace is used for long-term heat treatment, the heating temperature is 200°C-1200°C, and the holding time is 2min-20h. At this time, the self-corrosion potential is about -0.2, and the self-corrosion current density is significantly lower than that in the first method.

[0035] Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention provides a preparation method of a low-cost high-corrosion-resistance Monel metal coating. The preparation method is implemented by brush-plating a Ni coating and a Cu coating on a steel surface subjected to surface pretreatment by an electric brush plating process, and comprises the following steps: (1) positively connecting to the voltage, and brushing an electrocleaning solution on the surface; (2) negatively connecting to the voltage, and brushing a second activating solution on the surface; (3) negatively connecting to the voltage, and brushing a third activating solution on the surface; (4) while not connecting to the voltage, brushing special nickel on the surface; (5) positively connecting to the voltage, and brushing special nickel on the surface; (6) positively connecting to the voltage, and brushing quick nickel on the surface; (7) positively connecting to the voltage, and brushing alkaline copper on the surface; (8) positively connecting to the voltage, and brushing quick nickel on the surface; and (9) repeating the steps (7) and (8) 12-36 times, and carrying out heat treatment on the coating. The Monel metal layer prepared on the steel surface by the electric brush plating process has the advantages of high bonding strength with the base and excellent corrosion resistance, and can greatly lower the production cost.

Description

technical field [0001] The invention relates to a method for preparing a Monel coating on a steel surface by means of an electric brush plating method. Background technique [0002] Monel alloy is a nickel-copper alloy based on nickel, which is a high-performance corrosion-resistant material. Compared with general stainless steel, other corrosion-resistant metals, and non-metallic materials, it has the ability to resist various forms of corrosion damage in various corrosive environments. The mechanism of the excellent corrosion resistance of nickel alloys lies in, first, the standard electrode potential of nickel E. Ni 0 =-0.25V, slightly lower than hydrogen (E H 0 =0V), and it is easy to polarize, and hydrogen will not be precipitated during corrosion. The potential of nickel is positive relative to iron (E Fe 0 =-0.45V), and the ability to resist the corrosion of halogen gas and its hydride, and the corrosion resistance of NaOH, KOH and other hydroxide media is far ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/06C25D5/14
CPCC25D5/06C25D5/14
Inventor 于玉城王振玲管晓光孙检峰
Owner HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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