Corrosion resistance and adhesion evaluation of press hardened steel 22MnB5 coated with AlSi and ZnNi in cyclic corrosion testing

Abstract:

AlSi coating has been the most applied on press hardening steels – PHS. However, alternative coatings such as Zn-based alloys are under investigation. This paper has the objective of evaluating the corrosion resistance of the 22MnB5 steel, coated either with hot-dip AlSi or electroplated ZnNi, by means of cyclic corrosion test. Automotive parts of ZnNi coated PHS steel were tested in two different conditions: after hot stamping, and after hot stamping plus sandblasting. Other parts coated with AlSi were evaluated just in the after hot stamping condition. The cyclic corrosion test results showed that all metallic coated samples had excellent corrosion performance. However, the ZnNi coated in the as hot stamped condition, presented the best corrosion performance during testing. Surface coating cracks were found in all parts. Moreover, the adhesion was evaluated after 28 and 68 cycles in creepback area and the results showed that there was no loss of adhesion after the cyclic corrosion tests. The corrosion resistance results pointed that the electroplated ZnNi is a potential alternative to AlSi coating.


Reference:
COUTO, Camila Pucci; COSTA, Isolda; PANOSSIAN, Zehbour; COLOSIO, Marco A.; CAMPOS, Luiz G.F.P. de; ROSSI, Jesualdo L. Corrosion resistance and adhesion evaluation of press hardened steel 22MnB5 coated with AlSi and ZnNi in cyclic corrosion testing. In: INTERNATIONAL CORROSION MEETING, INTERCOOR, 7., 2018, São Paulo. Proceedings… São Paulo: ABRACO, 2018. 6 p.

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