預鍍鎳層對低碳鋼熱浸鍍鋁於高溫擴散之作用

Effect of Nickel Plating on the High-Temperature Diffusion Behavior of Al Hot-Dipped Low Carbon Steels

廖益樟(Y. J. Liao) ； 王朝正(C. J. Wang)

《防蝕工程》 25卷3期 (2011/09) Pp. 169-177

https://doi.org/10.6376/JCCE.201109.0169

摘要

本研究於低碳鋼表面以電鍍方式鍍鎳層再進行熱浸鍍純鋁後，於750℃靜滯空氣進行恆溫氧化與熱循環實驗，探討鎳鋁化塗層之相變化過程與動力學，並和低碳鋼熱浸鍍純鋁比較兩者鍍層之抗氧化性及熱循環行爲。實驗結果顯示，預鍍鎳低碳鋼熱浸鋁化塗層，由表面至基材分別爲純鋁塗層、NiAl3、Ni2Al3、NiAl、Ni3Al與純鎳層。經短時間擴散後，純鋁塗層與NiAl3轉變爲Ni2Al3，經120小時擴散，大部份Ni2Al3變爲NiAl相。鎳鋁化層中的鎳鋁交互擴散，在NiAl比Ni3Al有較低的活化能障，造成NiAl成長速率較高。預鍍鎳低碳鋼熱浸 鋁與低碳鋼熱浸鍍純鋁相比，在高溫空氣環境具有較優異的抗氧化性與受熱循環後之表現。

關鍵字

熱浸鍍 ； 低碳鋼 ； 恆溫氧化 ； 熱循環 ； 鋁化層

並列摘要

The purpose of this study was to investigate the effects of nickel-plating on the phase transformation, kinetics, and thermal-cycling oxidation behavior of Al hot-dipped low-carbon steels at 750℃ in dry air. The results were compared with those of the same steel with a direct Al hot-dipping (without Ni-plating). The results showed that Ni-Al layers having formed in the top coating consisted of NiAl3, Ni2Al3, NiAl, Ni3Al, and pure-nickel layers. However, most Ni2Al3 phase was transformed into a NiAl phase after a 120 hr exposure. Due to the lower activation energies for the growth of both NiAl and Ni3Al phases, their growth rates were much faster than those of the other Ni-Al phases. It was found that the steel with the nickel-plating treatment exhibited an excellent oxidation and thermal-cycling resistance with respect to that of the nickel-plating free steel.

並列關鍵字

Hot-dipping ； Low carbon steel ； Isothermal ； Thermal cycle ； Aluminide layer