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Modifizierte Onsite Aluminierung von Stählen mit Randschichtglühmethoden und einem chromat- und halogenaktivatorfreien Slurry

Description: Das Projekt "Modifizierte Onsite Aluminierung von Stählen mit Randschichtglühmethoden und einem chromat- und halogenaktivatorfreien Slurry" wird vom Umweltbundesamt gefördert und von DECHEMA Forschungsinstitut Stiftung bürgerlichen Rechts durchgeführt. The aluminization by means of commercial slurries is a coating method in which the aluminium (Al) diffusion coating is developed at the substrate surface by covering it with Al slurry, followed by a heat treatment. The disadvantages of this method are that the slurry usually includes toxic chromates and phosphates, that the heat treatment process has to be carried out in an inert atmosphere for several hours, which can be a logistical challenge, and furthermore the material microstructure can be affected adversely. The goal of this project is to develop a coating process by combining a non-toxic water-based slurry with a surface heat treatment, which can be performed by induction heating, burner flame, or heating mat for several minutes at ambient atmosphere. This includes several advantages such as health and environmental compatibility, cost saving, and easier material maintenance. Experiments on specimens of iron- and nickel-based alloys have shown that closed coatings can be developed by this method. However, they consist of intermetallic phases with a high aluminium concentration. The goal of this project is to optimize the coatings by promoting the development of the beta-FeAl and NiAl intermetallic phases and by adding other elements (e.g. Cr, Si, etc.) to the Al coating.

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SupportProgram

Origin: /Bund/UBA/UFORDAT

Tags: Gülle ? Chromat ? Aluminium ? Chrom ? Nickel ? Phosphat ? Phosphorsäureester ? Substrat ? Eisen ? Umgebungswärme ? Aufschlussverfahren ? Silizium ? Zivilrecht ? Anstrich ? Anfechtung ? Aufbereitungstechnik ? On-Site-Verfahren ? Schlamm ? Flächenheizung ? Instandhaltung ? Toxische Substanz ? Toxizität ? Oberflächenbehandlung ? Stahl ? Thermisches Verfahren ? Legierung ? Abdeckung ? Forschungseinrichtung ? Atmosphäre ? Heizung ? Umweltverträglichkeit ? Logistik ? Brenner ? Diffusion ? Flämmen ?

Region: Hessen

Bounding box: 9° .. 9° x 50.55° .. 50.55°

License: cc-by-nc-nd/4.0

Language: Deutsch

Organisations

Time ranges: 2014-07-01 - 2016-06-30

Status

Quality score

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