Method for forming on a metal substrate a protective...

Details Method for forming on a metal substrate a protective... Method for forming on a metal substrate a protective...

C - Chemistry, Metallurgy

23

C

C23C 18/16 (2006.01)

Patent

CA 2404446

The invention concerns a method wherein the substrate (5) to be coated is immersed in an autocatalytic chemical deposit bath (4), for example nickel, contained in a stainless steel vessel (1) and wherein can be optionally mixed a suspended MCrAlY alloy, so as to form a metal deposit (nickel) wherein are optionally included powder particles. The invention is characterised in that, to provide a prolonged operation of the bath, it consists in measuring with a voltmeter (8) the difference of potential between the substrate (5) and a reference electrode (6) immersed in the bath (4), and in imposing between the substrate (5) and the vessel (1) an electric current produced by a generator (10), said current being adjusted by a regulator (11) so as to maintain said potential difference at a selected value.

Image Le substrat (5) à revêtir est plongé dans un bain (4) de dépôt chimique autocatalytique, par exemple de nickel, contenu dans und cuve (1) en acier inoxydable et dans lequel on peut mélanger éventuellement une poudre d'alliage de type MCrAIY maintenue en suspension, de manière à former un dépôt du métal (nickel) dans lequel sont éventuellement incluses des particules de poudre. Selon l'invention, pour permettre un fonctionnement prolongé du bain, on mesure au moyen d'un voltmètre (8) la différence de potentiel entre le substrat (5) et une électrode de référence (6) plongée dans le bain (4), et on impose entre le substrat et la cuve (1) un courant électrique produit par un générateur (l0), ce courant étant réglé par un régulateur (11) de manière à maintenir la différence de potentiel précitée à une valeur choisie.

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