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Process for selective or complete inertisation of workpieces and system parts by means of non-reactive platings

A technology of equipment components and reaction layers, which is applied in the direction of metal material coating process, coating, liquid chemical plating, etc., can solve the problems of high cost and high cleaning cost, and achieve the effect of improving economy and shortening coating time

Inactive Publication Date: 2005-03-23
ENTHONE INC
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, these methods of selective coverage or passivation also require high process-related costs
As a result, the passivation layer, which may be subsequently removed, and the removal of most of the remaining material which cannot be reused lead to very high cleaning costs

Method used

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Examples

Experimental program
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Embodiment Construction

[0015] The electrolyte solution according to the invention for producing a selectively non-reactive layer on a substrate during metal deposition consists in principle of an activation solution with fluoride and / or fluorine compounds and one or more chromium-based salts, preferably It is composed of chromic acid or trivalent chromium compounds.

[0016] At bath temperature 20°C and applied 3A / dm 2 A smooth and uniform coating with no layer thickness limitation is deposited from electrolytes of the following composition at a voltage of :

[0017] 200-300g / l chromium (VI) oxide

[0018] 1-3g / l concentrated sulfuric acid

[0019] 0.02-0.03g / l fluoride

[0020] 0.2-3g / l methanesulfonic acid or methanesulfonic acid derivatives.

[0021] An example of application of the method according to the invention and of the electrolyte according to the invention is the coating of stainless steel with a passive chromium layer associated with the subsequent coating of the metal. In this cas...

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PUM

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Abstract

A method for the selective or complete rendering inert of substrates, workpieces, and components of the apparatus in the chemical deposition of metals by depositing nonreactive coatings thereon. A coating which is nonreactive with respect to the subsequent plating is electrolytically deposited on the sites of the substrate which are not to be plated from a solution containing an activator and an electrolyte. The inert, nonreactive coating is removable by means of dilute acids or alkaline media, without manual effort, after the subsequent chemical plating of the substrates, workpieces, or unit parts.

Description

technical field [0001] The invention relates to a method for the selective or complete passivation of substrates, workpieces and plant components by means of non-reactive coatings during the chemical deposition of metals. Background technique [0002] In addition to the electrolytic method of coating metals with basic working materials, so-called electroless plating has been known for a long time. No external current or also chemical coating of metals is to be understood as chemical surface finishing of almost all metals and many non-conductors. It is completely different from electroplated metal plating in its chemical and mechanical characteristics. Therefore, electroless metal coating involves an autocatalytic process. In this coating method, reactions take place on catalytic surfaces. In this case, the metal ions contained in the deposition bath (electrolyte) are reduced to elemental metals, while at least the reducing agent contained in the electrolyte is oxidized. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/18C23C18/16C23C18/31C25D3/04
CPCC23C18/1605C23C18/31C25D11/38
Inventor 赫尔穆特·霍斯特赫姆克安德烈亚斯·默比乌斯马利斯·克莱因菲尔德
Owner ENTHONE INC
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