Relation between microstructure and adhesion of hot dip galvanized zinc coatings on dual phase steel

详细信息	查看全文 | 推荐本文 |

• 作者：G.M. Song^a ; ^{g.song@tudelft.nl} ; ^{songguim@yahoo.com} ; T. Vystavel^b ; N. van der Pers^a ; J.Th.M. De Hosson^b ; W.G. Sloof^a
• 关键词：Zinc coatings ; Microstructure ; Interface cracking ; Work of adhesion ; Coating adhesion
• 刊名：Acta Materialia
• 出版年：2012
• 期刊代码：1_13596454
• 类别：ms
• 出版时间：April, 2012
• 卷：60
• 期：6-7
• 页码：2973-2981
• 文件大小：1349 K

摘要

The microstructure of hot dip galvanized zinc coatings on dual phase steel was investigated by electron microscopy and the coating adhesion characterized by tensile testing. The zinc coating consists of a zinc layer and columnar 味-FeZn₁₃ particles on top of a thin inhibition layer adjacent to the steel substrate. The inhibition layer is a thin compact and continuous layer that consists of 畏-Fe₂Al_5-xZn_x fine and coarse particles. The coarse faceted particles are on top and fine faceted particles are at the bottom. The steel surface is covered with small fraction manganese oxides, which may impair adhesion of the zinc coating. The adhesion at various interfaces that exist in zinc-coated steel was quantitatively estimated using a so-called 鈥渕acroscopic atom鈥?model. In addition, the adhesion at the interfaces in zinc-coated steel was qualitatively assessed by examining the fracture and delamination behavior upon tensile testing. In accordance with this model, fracture along zinc grain boundaries preceded fracture along the zinc layer/inhibition layer and 味-FeZn₁₃ particle/inhibition layer interfaces.