Method and device for the spectral analysis of a metal coating layer deposited on the surface of a steel strip

A metal coating and spectral analysis technology, applied in the field of spectral analysis of metal coatings, can solve problems such as exceeding the compensation ability
CN102428360AInactive Publication Date: 2012-04-25CLECIM SAS
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CLECIM SAS
Publication Date
2012-04-25
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention relates to a method for the spectral analysis of a metal coating layer deposited on the surface of a steel strip (1), characterised by the following steps: said strip is moved along an arc of the outer surface (813) of a rotating roller (8) with a cylindrical wall guiding the strip by contact; a so-called ablation laser beam is guided into an internal cavity of the cylindrical wall in order to be placed in optical incidence under a normal axis (41) on the outer surface of the roller on a targeted contact point (11) of the strip and the roller, said beam passing through the wall via a wall opening (811), which is transparent to the beam; a plasma spectral emission distribution from the laser ablation to the contact point is collected by optical feedback in the direction of the normal axis (41) on the outer surface of the roller and through the opening in order to be guided towards a spectral measurement unit; and the normal axis on the outer surface for the optical incidence and feedback is placed in synchronous rotation with the roller. The invention also relates to a device with a plurality of embodiments for implementing the method of the invention, as well as to the advantageous uses thereof.
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Description

technical field

[0001] The invention relates to a method and a device for the spectroscopic analysis of metal coatings deposited on the surface of a steel strip according to the preambles of claims 1 and 2 .

[0002] In particular, the invention relates to the quality control of metal coatings deposited by dipping a continuously moving metal strip, for example zinc alloy coatings subjected to alloying treatments. Background technique

[0003] Hot dip plating of continuously moving rolled steel strip is a well known technique. It basically consists of two options: one is that the steel strip coming out of the electroplating kiln descends obliquely into the pool of molten zinc and deflects it vertically upwards with submerged rollers in said molten zinc. Another option involves deflecting the moving strip vertically upwards at the kiln exit and then moving it through a vertical coating tank containing molten zinc supported on magnetic forces.

[0004] The formation kinetics ...

Claims

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