熱衝壓用抗高溫氧化塗層鋼板應用特性研究

The Characteristics of High Temperature Oxidation Resistance Coated Steel

汽車工業為了能同時滿足輕量化及安全性之要求，在高強度鋼用量方面持續的提升。而熱沖壓技術亦可以減少車體的重量及燃料的消耗量，同時間減少溫室氣體的排放，且不若一般傳統冷沖壓具有回彈的特性。在熱沖壓使用的材料方面，錳硼鋼裸材熱衝壓時會生成高溫氧化銹皮以及表面脫碳的現象，會影響工件的機械性質，且必須以噴砂去除，因此容易造成工件的尺寸精度下降。為了有更好的熱衝壓件尺寸精度，開發了塗裝於錳硼鋼表面以溶膠凝膠法製造的抗高溫氧化塗層，並進行熱衝壓後的點銲性與電著塗裝性的評估與測試，結果顯示其銲接性良好且電著塗裝層具有良好之附著性與耐蝕性。

In order to make the car body lighter and more secure, the car industry is using more and more high and ultra high strength steel . The use of hot stamped parts also reduces vehicle weight, fuel consumption, and greenhouse gases emission. In addition, hot stamped parts do not have the excessive springback which is the characteristic of the conventional high and ultra high strength steel press formed at room temperature. At present, the manganese-boron steel is used in hot stamping. When the bare manganese-boron steel is hot stamped, the steel surface is oxidized and decarburized. These two phenomena have a negative influence on both the surface appearance and mechanical properties. The scale on the hot stamped manganese-boron steel has to be removed by sand blasting , and the dimension of the stamped part may changed. In this study, a high temperature oxidation resistance coating, made by sol-gel method, was coated on manganese-boron steel and hot stamped. The hot stamped samples were spot welded and showed good weldability. The electric-deposited hot stamped samples were tested and demonstrated good adhesion and corrosion resistance properties.