ISSN 2594-5327
54º Congresso anual — Vol. 54 , num. 1 (1999)
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NITREG®-ONC, is a modern combination of the proven NITREG® controlled gas nitriding process and of a post-treatment oxidation stage, with impregnation of the surface by a liquid-based corrosion inhibitor. It has been successfully applied to simultaneously enhance corrosion and wear resistance of various grades of steel in automotive, hydraulic equipment, and tool applications. Emphasis is placed on unalloyed and low alloyed structural steels, exposed to especially great corrosion hazards, while requiring enhanced wear resistance. In this case, the ONC® treatment improves the corrosion resistance of as-nitrided surfaces. The application of surface impregnating agents, containing corrosion inhibitors, (CORR-CHECK™ process) brings about a further enhancement of their corrosion resistance. Nitrex Metal Inc. has performed a number of corrosion resistance studies, using the salt spray test, as specified by ASTM B-117. Additionally, some electrochemical investigations were carried out on 1006 steel to complement the salt spray tests. Material samples were evaluated metallographically in order to correlate corrosion behavior with thickness and microstructure of the nitrided layer. Optimum conditions of layer formation have been formulated. Wear resistance of nitrided and ONC®-treated layers, optimized for corrosion resistance, remained satisfactory.
NITREG®-ONC, is a modern combination of the proven NITREG® controlled gas nitriding process and of a post-treatment oxidation stage, with impregnation of the surface by a liquid-based corrosion inhibitor. It has been successfully applied to simultaneously enhance corrosion and wear resistance of various grades of steel in automotive, hydraulic equipment, and tool applications. Emphasis is placed on unalloyed and low alloyed structural steels, exposed to especially great corrosion hazards, while requiring enhanced wear resistance. In this case, the ONC® treatment improves the corrosion resistance of as-nitrided surfaces. The application of surface impregnating agents, containing corrosion inhibitors, (CORR-CHECK™ process) brings about a further enhancement of their corrosion resistance. Nitrex Metal Inc. has performed a number of corrosion resistance studies, using the salt spray test, as specified by ASTM B-117. Additionally, some electrochemical investigations were carried out on 1006 steel to complement the salt spray tests. Material samples were evaluated metallographically in order to correlate corrosion behavior with thickness and microstructure of the nitrided layer. Optimum conditions of layer formation have been formulated. Wear resistance of nitrided and ONC®-treated layers, optimized for corrosion resistance, remained satisfactory.
Palavras-chave
gas nitriding, white layer, porosity, corrosion resistance, wear resistance
gas nitriding, white layer, porosity, corrosion resistance, wear resistance
Como citar
Tymowski, George J.; Tacikowski, Jan; Korwin, Michel J.; Tarfa, Tahar; Liliental, Witold K..
NITREG®-ONC – A New, Improved Anti-Corrosion Treatment,
p. 217-226.
In: 54º Congresso anual,
São Paulo, Brasil,
1999.
ISSN: 2594-5327, DOI 10.5151/2594-5327-C00543
