Performance of finish coated galvanized steel sheets
for automotive bodies
Abstract High performance and cost reduction are principal concerns for vehicle manufacturers. In addition to shape, the exterior finish is the first thing a consumer sees when looking at a vehicle. The quality and durability of the finish is a reflection of the quality and durability of the vehicle itself. In this work, the behavior of two finish coat systems was studied. Finish coat system 1 included a powder coat, a waterborne base coat and a clear coat, and finish coat system 2 included the same powder coat, a solvent-based base coat and a clear coat. These finish coats were applied on unprimed and pre-primed electrogalvanized, hot dip galvanized and galvannealed steel. Before application, for each finish coat two activation treatments were considered: a conventional zinc phosphate for automotive industry and an experimental pretreatment. Three primers were considered. Primer 1 is an organic zinc rich silicate with a low thickness (near 4 um), primer 2 is a very thin (near 2 um) water-based primer filled with graphite and primer 3 is a conventional electrophoretic applied primer system.
用于汽車車身鍍鋅鋼板的修飾涂層性能研究

摘要 高性能和低成本是汽車制造商主要關(guān)心的問題。然而，消費者見到一輛車時第一印象的好壞便取決與汽車的形狀和涂層外觀。表面涂層的質(zhì)量和耐用性是汽車自身質(zhì)量和耐用性的直觀反映。在這個研究中，實驗對兩種不同修飾涂層方法的性能進行了考察。修飾涂層方法1，它包括粉末敷涂、水性漆打底和表面的凈化處理。修飾涂層方法2，它包括與方法1相同的粉末敷涂、用溶解能力強的漆打底以及干凈的表面。這些修飾涂層被應(yīng)用到未涂底漆和已涂底漆的鋅電鍍、熱鍍電鍍以及鍍鋅擴散處理的鋼鐵。鋼材涂裝處理前，需要考慮對修飾涂層的活化處理，其中主要的兩種活化處理包括：汽車行業(yè)傳統(tǒng)磷酸鋅的處理和經(jīng)驗性預(yù)處理。同時，對于修飾涂層的底漆研究了三種：底漆1是一種低厚度（大約4μm），富含硅酸鹽的有機鋅；底漆2是一種非常?。ù蠹s2μm）富含石墨的水基底漆；底漆3是底漆傳統(tǒng)電泳的方法。
為了對修飾涂層進行評價，樣品需要進行循環(huán)腐蝕試驗測定。然后對循環(huán)腐蝕試驗所得數(shù)據(jù)進行正交檢測，進而對涂漆的粘附力進行評估。