Stripper for special steel

Details Stripper for special steel Stripper for special steel

C - Chemistry, Metallurgy

23

G

C23G 1/08 (2006.01) C23G 1/02 (2006.01)

Patent

CA 2338484

The invention relates to an aqueous stripper free of wetting agents and emulsifiers, intended for use with special steels. Said stripper, on a basis of sulfuric acid or phosphoric acid and hydrofluoric acid, contains (in each case in relation to 100 percent by weight of substance): between 1.5 and 16 weight percent sulfuric acid or between 2.0 and 30 weight percent phosphoric acid, as well as between 0.5 and 14 weight percent hydrofluoric acid and between 0.5 and 15.5 weight percent acid-soluble aromatic nitro compounds. No iron(III) compounds are added to said stripper. Only in the initial phase an oxidizing agent which oxidizes iron(II) to iron(III) may be added. As acid- soluble aromatic nitro compound m-nitrobenzol sulfonate and/or 3- nitrophthalate are especially advantageous. The stripper provided for by the invention can be used in a stripping bath and, if between 2.5 and 5.5 weight percent magnesium and/or magnesium compound (calculated as Mg) are added, can also be applied by spraying or with a brush.

L'invention concerne un décapant aqueux, sans agent mouillant ni émulsifiant, pour aciers spéciaux. Ce décapant à base d'acide sulfurique ou d'acide phosphorique ou de fluorure d'hydrogène contient (à chaque fois par rapport à 100 % en poids de substance) : 1,4 à 16 % en poids d'acide sulfurique ou 2,0 à 30 % en poids d'acide phosphorique, ainsi que 0,5 à 14 % en poids de fluorure d'hydrogène et 0,5 à 15,5 % en poids d'un dérivé nitré aromatique soluble dans l'acide. Aucun dérivé ferrique n'est ajouté audit décapant. On peut ajouter, uniquement dans la phase initiale, un agent d'oxydation qui oxyde le composé ferreux en composé ferrique. Il est particulièrement avantageux d'utiliser du sulfonate de m-nitrobenzène et/ou du 3-nitrophtalate comme dérivé nitré aromatique soluble dans l'acide. On peut utiliser ce décapant sous forme de bain décapant et, en ajoutant 2,5 à 5,5 % en poids de magnésium et/ou d'un dérivé de magnésium (calculé en tant que Mg), l'appliquer par pulvérisation ou au pinceau.

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