Press-hardened steel structure parts are setting new standards in the lightweight construction of car bodies. Weight savings of more than 10% at simultaneously higher strength can be reached. The parts of the passenger cab at risk of corrosion are an enormous challenge. As solution, the zinc diffusion coating which is also known as Sherardizing offers itself. Although Sherardizing is a long time known, well proven procedure for zinc coating of bulk goods for fixing elements as e.g. screws and nuts, its basic metallurgical principles are sparsely explored. Therefore, the process control basics have been experimentally and theoretically investigated in a project accompanying research and development program. A pilot line with a useful volume of 10 m3 has been designed for purposes of development, prototype technical-release procedures and pilot production. The line allows the treatment of all structure parts generally used in vehicles in charge sizes suitable for series production. The experiments have been made in this line as well as in a special laboratory line. The results are presented and interpreted. The achieved coating thickness, spot weldability, mechanical and corrosion technical features of real components fulfil all requirements and specifications of the automotive industry.
Corrosion protection of press-hardened structure parts by zinc diffusion coating
Korrosionsschutz durch das Diffusionsverzinken von in einer Presse gehärteten Bauteilen
2006
4 Seiten, 5 Bilder, 1 Tabelle, 4 Quellen
Conference paper
English
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