Study of the influence of the characteristics of phosphated layers in stamping operations with and without lubricants

• Grant number: 04/08042-5
• Support Opportunities: Research Grants - Research Partnership for Technological Innovation - PITE
• Start date: March 01, 2005
• End date: December 31, 2008
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
• Principal Investigator: Zehbour Panossian
• Grantee: Zehbour Panossian
• Host Institution: Instituto de Pesquisas Tecnológicas S/A (IPT). Secretaria de Desenvolvimento Econômico (São Paulo - Estado). São Paulo , SP, Brazil
• Company: Brasmetal Waelzholz Indústria e Comércio
• City: São Paulo

Abstract

Phosphatized layers on ferrous metals are used, among other purposes, to facilitate conformation operations with the use of the traditional zinc phosphate-based baths. Normally the application process of the phosphatized layers immediately precedes the conformation stage, and it is done by the same company that carries it out. In this case, the post-treatment of the phosphatized layers consists of the application of a lubricant without anticorrosive properties, since there is practically no waiting time between the application of the phosphatized layer and the conformation operation. However, although not very common, phosphatization can be carried out by the company supplying the metal sheets. This situation occurs in Brasmetal, which sells steel sheets already phosphatized and lubricated, ready for cutting and conformation. Thus, the post-treatment of the phosphatized layers must take into account the possible occurrence of corrosion of the sheets in the storage and transport phases. Therefore, a lubricant with anticorrosive properties should be applied or some other product should be applied over the lubricant that will protect the phosphatized and lubricated sheet. The aim of this project is to carry out a systematic study for the purposes of correlating the performance of different phosphatized layers with different lubricants aiming for the mechanical conformation of phosphatized layers. (AU)