Analysis of coating layer formedon steel strips during aluminising by hot dipping in Al-Si baths

Microstructural Changes of Al Hot-Dipped P91 Steel during High-Temperature Oxidation

“…Hot dipping formed a~20 µm-thick topcoat (spots 1-6), 15 µm-thick transient alloy layer (spots 7-10), and~35 µm-thick underlying alloy layer (spots [11][12][13][14][15][16][17][18][19] on the steel substrate (spots 20-24) (Figure 2a [4,8,13,14,18]. Hence, the Al 5 Fe 2 layer (spots [11][12][13][14][15][16][17][18][19] was thicker than the Al 13 Fe 4 layer (spots 7-10 inside the alloy layer) [10,11]. On the other hand, in the case of low-alloyed carbon steels, the characteristic finger-or tongue-like morphology that oriented along the c-axis of Al 5 Fe 2 generally developed at the coating/substrate interface [4][5][6]9,10,12,13].…”

“…Hence, the high-temperature oxidation resistance of 9Cr-1Mo steels needs to be improved through surface modification techniques. Aluminum hot-dipping is a simple, cost-effective coating technique that could form the compact, slow growing, protective alumina scale in reaction with oxygen at high temperatures [4][5][6][7][8][9][10][11][12][13][14][15]. It also improves the surface hardness by forming Al-Fe intermetallics [5,7,9,13].…”

Kesan Suhu Celupan ke atas Mikrostruktur dan Kekerasan Salutan Aluminium pada Keluli Karbon

“…Kemudian sampel ini dicuci secara ultrasonik di dalam aseton untuk menghilangkan kandungan bendasing yang terdapat pada permukaan sampel. Komposisi sampel keluli karbon diuji dengan menggunakan peralatan percikan arka (Eggeler et al 1985;El-Mahallawy et al 1997). Kewujudan morfologi tidak sekata ini adalah disebabkan oleh resapan secara tidak isotropik (berlakunya orientasi terpilih) bagi struktur ortorombik dengan kepekatan kekosongan yang tinggi berlaku pada paksi C (Bouayad et al 2003).…”

Super anticorrosion of aluminized steel by a controlled Mg supply

“…As an alternative, hot-dip aluminized steel is used widely, particularly for materials in automotive exhaustion parts, outdoor building parts, and various high strength parts, on account of its superior corrosion resistance to hot-dip galvanized steel and its attractive surface 9–11 . The reason for the enhanced anti-oxidation capability of aluminized steel is the formation of a protective, dense, and stable Al 2 O 3 layer on the surface of the aluminized layer on steels 12,13 .…”