| MA Er-qing,CUI Lei,PENG Meng-du,XIAO Yang-yang,LIU Yang,WANG Zhong-le.Effect of EPS Treatment on Surface Quality of Hot Dip Galvanized High Strength Steel[J],49(6):352-358 |
| Effect of EPS Treatment on Surface Quality of Hot Dip Galvanized High Strength Steel |
| Received:November 07, 2019 Revised:June 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.06.043 |
| KeyWord:EPS hot dip galvanized high strength steel folding surface surface up-warping plating leakage |
| Author | Institution |
| MA Er-qing |
Maanshan Iron & Steel Co, Ltd, Maanshan , China |
| CUI Lei |
Maanshan Iron & Steel Co, Ltd, Maanshan , China |
| PENG Meng-du |
Maanshan Iron & Steel Co, Ltd, Maanshan , China |
| XIAO Yang-yang |
Maanshan Iron & Steel Co, Ltd, Maanshan , China |
| LIU Yang |
Maanshan Iron & Steel Co, Ltd, Maanshan , China |
| WANG Zhong-le |
Maanshan Iron & Steel Co, Ltd, Maanshan , China |
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| Abstract: |
| The work aims to study the influence of EPS treatment on the surface quality and hot-dip galvanizing effect of 800 MPa grade high-strength steel. Optical microscope (OM), scanning electron microscope (SEM) and glow discharge spectrometer (GDS) were used to study the surface morphology and surface composition distribution in Eco Pickled Surface (EPS) treatment and hydrochloric acid pickling treatment, cold rolling and hot dip galvanizing. The surface of EPS treatment coil was quasi valley, while the surface of hydrochloric acid pickling state was flat. The surface roughness value of EPS treated coil was 2.645 μm, about 2 times that of the hydrochloric acid pickling coil, and the thickness of the remaining surface oxidized iron sheet was 0.93 μm, 45% higher than that of the hydrochloric acid pickling steel coil. In the cold-rolled state, the surface of the EPS treatment coil was flattened, and the surface whiteness of the substrate was about 63.5%, 20.1% lower than that of hydrochloric acid pickling. The residual oxidized iron thickness of EPS treatment coil was 0.36 μm, 57% thicker than that of hydrochloric acid pickling steel coil. Under the condition of hot dip galvanization, there were pores of 3~5 μm in the grain boundary of zinc coil treated with EPS, and the surface was prone to plating leakage defects of about 1 cm in size. After the zinc layer on the surface was removed, the substrate surface treated with EPS was up-warped. For the inhibition layer, the particles of Fe-Al inhibition layer at the interface were not fully formed, or even not formed. GDS result showed that Al peak value at inhibition layer was 17% lower than that of hydrochloric acid pickling coil. After treatment with EPS, the surface is uneven, and it is easy to fold layer during cold rolling. After removal of the zinc layer, the substrate surface is up-warped and is easy to cause uneven thickness of zinc layer. At the same time, the surface treated by EPS has a thick residual oxidation layer and tends to cause the iron oxide scale to be embedded in the substrate, leading to sparse Fe-Al inhibition layer between the zinc-layer and the substrate interface, which resulted in low adhesion of the zinc layer and even plating leakage. |
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