Influence of the Zinc Coated Sheets Surface Treatment on the Friction Coefficient

Shailender Ezhilarasan

Master's thesis

Abstract:

The main aim of this thesis was to carry out tribological measurement and comparison of tribological results for two selected surface treatments. That is why this thesis deals with the tribological testing and comparison of results for zinc coated sheets. Two different types of surface coatings (hot dip galvanized HDG and new inorganic treatment NIT) on deep drawing steel sheet were tested by a tribological test called as strip drawing test on the testing device SOKOL400 under the combinations of feed rates v [mm/sec] and contact pressure p [MPa]. Firstly, different kinds of forces (Fmax, Fh, Favg, Fmin and F) were evaluated for both tested surfaces. Moreover, the friction coefficient ? [1] was computed as well. For better overview of final results, there were finally created 3D color map surface graphs. According to the results, NIT coating revealed a much better tribological behavior than HDG coating under the higher feed rates and especially under the higher contact pressures. However, these data are needed to be verified by more experiments and other kind of testing (with different coatings) is also necessary to be performed.

Abstract:

The main aim of this thesis was to carry out tribological measurement and comparison of tribological results for two selected surface treatments. That is why this thesis deals with the tribological testing and comparison of results for zinc coated sheets. Two different types of surface coatings (hot dip galvanized HDG and new inorganic treatment NIT) on deep drawing steel sheet were tested by a tribological test called as strip drawing test on the testing device SOKOL400 under the combinations of feed rates v [mm/sec] and contact pressure p [MPa]. Firstly, different kinds of forces (Fmax, Fh, Favg, Fmin and F) were evaluated for both tested surfaces. Moreover, the friction coefficient ? [1] was computed as well. For better overview of final results, there were finally created 3D color map surface graphs. According to the results, NIT coating revealed a much better tribological behavior than HDG coating under the higher feed rates and especially under the higher contact pressures. However, these data are needed to be verified by more experiments and other kind of testing (with different coatings) is also necessary to be performed.

Keywords

Tribology, Surface Treatment, Friction Coefficient, Strip Drawing Test, 3D Color Map Surface Graph

Language used: English

Date on which the thesis was submitted / produced: 21. 5. 2018

Thesis defence

• Supervisor: Ing. Jiří Sobotka, Ph.D.

Technical University of Liberec

Faculty of Mechanical Engineering

Master programme / field:
Mechanical Engineering / Engineering Technology and Materiales