Method of treating a metal element for an automobile

摘要

A method for treating a metal element for an automobile includes hardening the metal element so as to obtain a press hardened metal element. Scale from the press hardened metal element are removed by placing the press hardened metal element in an ultrasonic liquid and preforming an ultrasonic process thereon so as to obtain a de-scaled press hardened metal element. The ultrasonic liquid is an aqueous solution comprising an organic carboxylic acid in a concentration of from 0.1 to 10 vol.-%. The de-scaled press hardened metal element is coated in a coating process with an anti-corrosion coating.

主权项

1. A method for treating a metal element for an automobile, the method comprising:
hardening the metal element so as to obtain a press hardened metal element; removing scale from the press hardened metal element by placing the press hardened metal element in an ultrasonic liquid and preforming an ultrasonic process thereon so as to obtain a de-scaled press hardened metal element, wherein the ultrasonic liquid is an aqueous solution comprising an organic carboxylic acid in a concentration of from 0.1 to 10 vol.-%, and the ultrasonic process comprises an ultrasonic frequency of between 18 kHz and 60 kHz; and coating the de-scaled press hardened metal element in a coating process with an anti-corrosion coating, wherein the ultrasonic frequency is varied/modified during a part of or during the entire ultrasonic process step.