Electroless metal coatings

An electroless nickel plating and coating technology, which is applied in the direction of metal material coating process, coating, liquid chemical plating, etc., can solve the problems of electroless nickel plating coating strain tolerance corrosion resistance, product corrosion, shortened service life, etc.

Inactive Publication Date: 2011-09-21
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, high temperature heat treatment of electroless nickel-coated articles results in changes in the microstructure of the coating, resulting in poor strain tolerance or corrosion resistance of heat-treated electroless nickel coatings
Poor adhesion and / or coating cracking of electroless metal coatings can result in reduced useful life of articles containing electroless metal coatings
Additionally, articles may be subject to corrosion due to lack of coating protection in harsh chemical environments such as sour gas environments

Method used

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  • Electroless metal coatings

Examples

Experimental program
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Effect test

Embodiment 1

[0038] The surface-prepared samples are preheated and fixed to a fixture, followed by immersion in an electroless plating solution. The pH of the electroless plating solution was monitored with a sensitive pH strip ranging from pH 5 to pH 8 and maintained at about pH 7 by the dropwise addition of lactic acid solution. Take care to avoid the presence of any sodium hydroxide to prevent the formation of a nickel hydroxide precipitate. At the beginning of the plating step, the sample was rotated at about 4 rpm while submerged. Blistering appeared at the end of 30 seconds, indicating the start of plating. Allow the sample to rotate at a constant speed in the electroless plating solution. At a temperature of about 85°C, at a pH of about 5.9, the plating rate was maintained at about 0.75 mil / hr for about 2.5 hours. The thickness of the applied coating is monitored with a witness coupon (typically a blade or dip pan) and measured with a micrometer. Once the desired coating thickne...

Embodiment 2

[0053] Surface prepared samples (impeller assemblies made from Al82F22 low alloy steel) were coated with the electroless nickel coating composition as described above in Example 1 . The surface-prepared samples were preheated and fixed to a fixture before being immersed in an electroless plating solution. The pH of the electroless plating solution was monitored with a sensitive pH strip ranging from pH 5 to pH 8 and maintained at about pH 7 by the dropwise addition of lactic acid solution. Take care to avoid the presence of any sodium hydroxide to prevent the formation of a nickel hydroxide precipitate. At the beginning of the plating step, the sample was rotated at about 4 rpm while submerged. Blistering appeared at the end of 30 seconds, indicating the start of plating. Allow the sample to rotate at a continuous speed in the electroless plating solution. At a temperature of about 85°C, at a pH of about 5.9, the plating rate was maintained at about 0.325 mil / hr for about 1...

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Abstract

The present invention provides a method for preparing an electroless nickel coating composition that includes (a) coating a substrate with an electroless nickel coating to provide a coated substrate; and (b) subjecting the coated substrate to a heating protocol comprising heating to a temperature in a range from about 550 DEG C. to about 700 DEG C. for a period of from about 7 to about 30 hours. An article made from the method is also provided.

Description

technical field [0001] This invention relates generally to electroless metal coating compositions and, more particularly, to methods of electroless nickel coating and articles made therefrom. Background technique [0002] Electroless metal coatings are used in a variety of applications where a protective coating is required to enhance the performance characteristics of the substrate underlying the electroless metal coating. The application of this coating lies primarily in the enhanced physical properties (such as hardness) of the electroless metal coating relative to the substrate on which the coating is placed. In addition, electroless metal coatings can be used to protect articles that are otherwise susceptible to corrosion from chemicals present in the environment in which the article is used. Additionally, since the electroless metal coating is applied to the substrate from solution, the substrate can have a variety of shapes, sizes and perforations and still result in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/36
CPCC23C18/32Y10T428/12944Y10T428/31678
Inventor F·索波L·B·库尔W·C·布鲁克斯M·吉安诺滋E·吉奥尼T·兰塞克S·A·特索伊D·M·格雷T·C·库蒂斯
Owner GENERAL ELECTRIC CO
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