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Corrosion resistant coating based on silicon, carbon, hydrogen and nitrogen

A coating and anti-corrosion technology, applied in coating, metal material coating process, transportation and packaging, etc., can solve problems such as difficult to be used, unable to provide corrosion protection, negative impact of toxic environment, etc.

Inactive Publication Date: 2014-05-14
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Their very high hardness gives them very high wear resistance, but current deposition techniques cannot deposit them to great thicknesses, therefore, they offer little corrosion protection
The same applies to amorphous carbon coatings, which effectively protect against friction and wear, but whose thickness does not exceed a few microns in the best case and therefore does not provide effective corrosion protection
[0006] Electrolytic deposition of cadmium or lead has been used for a long time but is now abandoned due to the toxicity of these materials and their negative impact on the environment
Electrodeposited chromium also has a negative impact on the environment, and developments in regulations regarding waste make them increasingly difficult to use

Method used

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  • Corrosion resistant coating based on silicon, carbon, hydrogen and nitrogen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 14

[0038] Example 14 concerns a substrate coated with the same SiCHN layer as described in Example 6; this layer is itself coated with a 5 μm thick layer of DLC. Naturally, the hardness determined as described above corresponds to the hardness of the surface layer, ie the DLC layer.

Embodiment 15

[0039] Example 15 shows the properties of tool steel without coating.

[0040] Note that Examples 1 to 4 explain the benefit of the presence of nitrogen, while Examples 9-12 show the importance of the ratio N / C, and Example 13 appears to constitute a limit explaining the threshold of 0.9 for the ratio N / C .

[0041] When referring to the "good" examples (letter C in the penultimate column), it is to be noted that their hardness is significantly less than 2100daN / mm 2 and their N / C ratios are significantly greater than 1 (at least 1.2 in Example 6), with values ​​reaching 2.4 (Example 8); the nitrogen content is greater than each of Si, C or H (at least 29 at%, with an example of 40 at%, but this is not limiting).

[0042] A comparison of the two preferred examples (6 and 7) appears to show that the H content is greater or less than Si, both elements are present at the same atomic concentration in the range of 20 ± 5 atomic %; moreover, the carbon content In the same range a...

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Abstract

The invention relates to a thin coating which can be used for anti-corrosion of corrosible materials. The Coating for metal components subject to corrosion is made essentially from silicon, carbon, hydrogen and nitrogen in a compound with the atomic content of hydrogen, measured by the Elastic Recoil Detection Analysis technique (ERDA) is between 15 and 25 atoms per cent, the atomic content of silicon, measured by the Rutherford retrodiffusion technique (RBS) is between 15 and 28 atoms per cent, and the nitrogen / carbon atomic concentration ratio is above 0.9 : 1, with impurities accounting for a maximum of 5 atoms per cent. The coating material's hardness is no greater than 2100 daN / sq mm.

Description

[0001] This divisional application is based on the divisional application of the original Chinese patent application with the application number 200680036545.1, the application date is September 28, 2006, and the invention title is "corrosion-resistant coating based on silicon, carbon, hydrogen and nitrogen". technical field [0002] The present invention relates to the protection of components whose surfaces are sensitive to corrosion (dry or wet) and optionally, to a lesser extent, to frottement and usure. More specifically, the field of the invention concerns the treatment and coating of surfaces intended to resist corrosion, with or without friction and wear. [0003] The parts targeted by the present invention are actually corrodible metal parts, non-limiting examples are parts made of steel, aluminum alloys, magnesium alloys, or non-metallic parts coated with corrodible metals, preferably structural or Surface mechanical components, not exclusively, for example in the au...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C30/00C23C28/04
CPCC23C16/36C23C30/00C23C28/044C23C28/046C23C28/321C23C28/343C23C28/347Y10T428/26Y10T428/30Y10T428/31678
Inventor P·莫兰-皮瑞尔C·埃奥Y·加雄
Owner H E F