ISSN 2594-5297
38º Simpósio de Laminação — Vol. 38, Num. 38 (2001)
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Abstract
Corrosion inhibitors are used in the steel industry in different processes for the production and plating of steel strips. For example, they are used in pickling baths for descaling after hot-rolling or in pickling baths which are located between an alkaline cleaning section and the electrolytic cells in the plating processes. Different inhibitors are required for sulphuric ahd hydrochloric acid pickling. In laboratory tests performed at the research centers for surface technology of Thyssen Krupp Stahl AG (TKS) and SurTec GmbH the effect of corrosion inhibitors were studied in detail. Relatively low inhibitor concentrations protected steel surfaces from excessive pickling effects in both sulphuric acid and hydrochloric acid baths. The use of these inhibitors in pickling solutions before zinc plating did not effect the properties of the zinc coated products or the subsequent surface treatment of thern. These inhibitors increased the life time of both pickling baths and protected the steel surface during the one side plating frorn discoloration. By selecting the right inhibitor, hydrogen diffusion into the metal causing hydrogen embrittlement can be reduced. During descaling after hot-rolling an inhibitor in the pickling solution reduces the acid attack to the steel surface and the creation of micro flaps. To achieve a constant product quality, a regular analysis of the inhibitor concentration in the pickling bath is necessary. This can be done via HPLC-analysis or via measuring the weight losses of the test coupons during pickling.
Corrosion inhibitors are used in the steel industry in different processes for the production and plating of steel strips. For example, they are used in pickling baths for descaling after hot-rolling or in pickling baths which are located between an alkaline cleaning section and the electrolytic cells in the plating processes. Different inhibitors are required for sulphuric ahd hydrochloric acid pickling. In laboratory tests performed at the research centers for surface technology of Thyssen Krupp Stahl AG (TKS) and SurTec GmbH the effect of corrosion inhibitors were studied in detail. Relatively low inhibitor concentrations protected steel surfaces from excessive pickling effects in both sulphuric acid and hydrochloric acid baths. The use of these inhibitors in pickling solutions before zinc plating did not effect the properties of the zinc coated products or the subsequent surface treatment of thern. These inhibitors increased the life time of both pickling baths and protected the steel surface during the one side plating frorn discoloration. By selecting the right inhibitor, hydrogen diffusion into the metal causing hydrogen embrittlement can be reduced. During descaling after hot-rolling an inhibitor in the pickling solution reduces the acid attack to the steel surface and the creation of micro flaps. To achieve a constant product quality, a regular analysis of the inhibitor concentration in the pickling bath is necessary. This can be done via HPLC-analysis or via measuring the weight losses of the test coupons during pickling.
Keywords
Corrosion inhibitors; pickling; steel strip; zinc coating; hydrogen embrittlement; descaling
Corrosion inhibitors; pickling; steel strip; zinc coating; hydrogen embrittlement; descaling
How to cite
Etzold, K.P. Mohr (Thyssen Krupp Stahl AG), U.; Hulser (SurTec GmbH), P..
The Use of Corrosion Inhibitors in Steel Strip Production and Coating,
p. 533-548.
In: 38º Simpósio de Laminação,
Florianópolis - SC, Brasil,
2001.
ISSN: 2594-5297, DOI 10.5151/2594-5297-LAC01575
