Pickling agent containing urea and method of producing it

Details Pickling agent containing urea and method of producing it Pickling agent containing urea and method of producing it

C - Chemistry, Metallurgy

23

G

C23G 1/08 (2006.01) C23G 1/02 (2006.01) C25F 1/06 (2006.01)

Patent

CA 2394686

A long-time stable pickling agent for the removal of an oxide layer on a stainless steel after heat treatment, such as welding, which pickling agent comprises nitric acid and fillers and constitutes of a pickling paste or pickling gel to be coated on the heat treated stainless steel, or of a pickling liquid to be sprayed on the steel. According to the invention, the pickling agent also comprises urea for reduced formation of nitrous fumes when the pickling agent is used.

La présente invention concerne un agent de décapage stable dans le long terme destiné à retirer une couche d'oxyde sur un acier inoxydable après un traitement thermique, tel qu'un soudage. Cet agent de décapage comprend de l'acide nitrique et des charges et il est constitué d'une pâte de décapage ou d'un gel de décapage à déposer sur l'acier inoxydable thermotraité, ou d'un liquide de décapage à pulvériser sur cet acier. Selon cette invention, cet agent de décapage comprend aussi de l'urée destinée à réduire la formation d'émanations nitreuses lorsqu'on utilise cet agent de décapage.

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