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Process For Coating Discrete Articles With A Zinc-based Alloyed Layer

A workpiece and coating technology, applied in metal material coating process, gaseous chemical plating, coating, etc., can solve problems such as aggravation, undetermined process parameters, adverse effects of steel characteristics, etc., and achieve good coating adhesion Effect

Inactive Publication Date: 2016-03-16
UMICORE AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, hot dip coating at such high temperatures can lead to potentially harmful thermal stresses in the workpiece
Also, the characteristics of the steel itself may be adversely affected
Compounding the problem is a typical hot dip rack with multiple discrete workpieces made of different steel grades
This makes it impossible to determine suitable process parameters for all workpieces, such as bath temperature or immersion time

Method used

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  • Process For Coating Discrete Articles With A Zinc-based Alloyed Layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0038] refer to figure 1 , the coating furnace basically includes:

[0039] - a hermetically sealed process chamber (1);

[0040]- a heating device (2) to control the temperature of the workpiece as well as the chamber atmosphere and walls; this device may be in or around the process chamber;

[0041] - a vacuum system (3) to extract gases such as N 2 、H 2 、H 2 O and air;

[0042] - for gases such as N 2 、H 2 and air gas injection device (4).

[0043] - access port (5) for introducing and extracting coated workpieces;

[0044] - A supply (6) for the addition of Zn in the process chamber; either introducing the metal directly into the chamber or through a gas injection device connected to the evaporator.

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Abstract

The present disclosure concerns a process suitable for coating discrete articles with a zinc-rich, fully alloyed layer. A known method for the corrosion-protection of such articles comprises the steps of hot-dip galvannealing, typically followed by painting. This hot-dip process has however to be performed at a high temperature, thereby submitting the articles to severe thermal stress. A novel vacuum deposition process of Zn is therefore presented. It is characterized in that, in the step of contacting the article with metallic Zn vapor, the temperature of the article is equal to or higher than the dew point of the Zn vapor. The process results in a coating having a uniform thickness, even on less accessible surfaces. The surface roughness is well adapted for the adhesion of paint.

Description

[0001] This application is a divisional application of a Chinese invention patent application with an application date of February 4, 2010, an application number of 201080006697.3, and an invention title of "Process for Coating Discrete Workpieces with a Zinc-Based Alloyed Layer". technical field [0002] The present invention relates to a process for coating discrete workpieces with a zinc-based alloying layer. In particular, the present disclosure relates to a process suitable for plating workpieces, especially discrete articles, with a zinc-rich fully alloyed layer. Background technique [0003] Discrete workpieces refer to discontinuous workpieces, which generally have at least one concave surface. They usually contain a combination of connected parts. [0004] The disclosed process is suitable for applying a zinc-based protective coating on iron or steel, wherein Zn-Fe intermetallics are formed throughout the thickness of the coating. This coating is similar to the la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C10/02C23C10/08
CPCC23C10/02C23C10/08C23C10/06C23C14/021C23C14/541C23C14/16C23C14/02C23C14/06C23C14/085C23C14/086C23C16/06C23C16/44
Inventor 布鲁诺·盖伊艾蒂安·佩蒂特
Owner UMICORE AG & CO KG