LAUSR

The paper deals with the monitoring the utility properties of the Al-Si coating which is applied by means of the hot dip coating on the ultra-high strength sheet 22MnB5 (martensite steel alloyed by boron). These sheets are used at the car-body design as the safety elements (bumpers, reinforcement posts). Individual parts are jointed also by the adhesive bonding methods. Evaluation of the material surface protection layers is carried out in dependence on the time of material heating in the furnace during thermal treatment and subsequent influence of this layer on the adhesive joint strength and failure pattern. To compare adhesive joint strength is used epoxy adhesive from two producers. Results provide information about behavior of the ultra-high strength sheets adhesive joints strength properties as a criterion for suitability to apply coatings AlSi in the series production of cars.