文章信息/Info

Title:

Research on Properties of Al Alloy for In-Situ Hydrogen Production

文章編號:

1674-3962(2020)12-0974-07

作者:

汪洪波1; 2; 謝志雄1; 2; 周敏1; 2; 許章華1; 2; 陳晨1; 2; 董仕節(jié)1; 2; 黃海軍3

（1. 湖北工業(yè)大學(xué) 綠色輕工材料湖北省重點實驗室， 湖北 武漢 430068）（2. 湖北工業(yè)大學(xué)材料與化學(xué)工程學(xué)院， 湖北 武漢 430068）（3 上海交通大學(xué) 金屬基復(fù)合材料國家重點實驗室， 上海 200240）

Author(s):

WANG Hongbo1; 2;  XIE Zhixiong1; 2;  ZHOU Min1; 2;  XU Zhanghua1; 2;  CHEN Chen1; 2;  DONG Shijie1; 2;  HUANG Haijun3

(1. Hubei Provincial Key Laboratory of Green Materials for Light Industry, Hubei University of Technology, Wuhan 430068, China) (2. School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China) (3. The State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China)

關(guān)鍵詞:

AlTi5B; 鋁合金; 氫氣; 水; 原位產(chǎn)氫

Keywords:

AlTi5B;  Al alloy;  hydrogen;  water;  in-situ hydrogen production

分類號:

TK91

DOI:

10.7502/j.issn.1674-3962.201908031

文獻標志碼:

A

摘要:

利用熔鑄法制備了一種原位產(chǎn)氫用高反應(yīng)活性的鋁合金。結(jié)果表明，添加適量的AlTi5B能顯著提高Al-3Ga-3In-3Sn鋁合金水解產(chǎn)氫性能。反應(yīng)溫度為20 ℃時，1 g Al-3Ga-3In-3Sn鋁合金水解反應(yīng)230 min，產(chǎn)氫量為980 mL，轉(zhuǎn)化率為79.3%；而1 g Al-3Ga-3In-3Sn-0.1%AlTi5B鋁合金（合金名稱中百分數(shù)為質(zhì)量百分數(shù)，下同）反應(yīng)230 min，產(chǎn)氫量達1200 mL，轉(zhuǎn)化率達97.1%。隨著水解溫度的升高，鋁合金產(chǎn)氫性能進一步提升。AlTi5B促進Al-3Ga-3In-3Sn鋁合金水解產(chǎn)氫性能提升的原因可主要歸結(jié)為以下3個因素：一是加入AlTi5B后，鋁晶粒得到了顯著細化，鋁晶粒平均尺寸由原來的70 μm的柱狀晶變?yōu)?0 μm的等軸晶，晶界面積大幅度增加，Ga-In-Sn共晶合金（GIS）晶界相體積分數(shù)增加；二是AlTi5B的添加使Al��3Ga-3In-3Sn-0.1%AlTi5B鋁合金晶界形成低熔點的GIS相，當(dāng)鋁合金的水解溫度高于GIS相的熔點時，GIS相變?yōu)橐簯B(tài)，不僅為鋁原子與水的反應(yīng)提供了通道，而且還保護了鋁原子不被氧化，進而促進了鋁合金與水的反應(yīng)；三是AlTi5B的添加進一步降低了鋁合金的開路電壓，增加了鋁合金活性，促進了鋁合金與水的反應(yīng)。

Abstract:

A highly activated aluminum alloy for portable in-situ hydrogen production was prepared using melt-casting method. The results showed that the addition of a proper amount of AlTi5B to Al-3Ga-3In-3Sn aluminum alloy can significantly improve the hydrogen production performance of aluminum alloy. When the water temperature is 20 ℃, 1 g Al-3Ga-3In-3Sn aluminum alloy reacts for 230 min to produce 980 mL of hydrogen and get a conversion rate of 79.3%, while 1 g Al-3Ga-3In-3Sn-0.1%AlTi5B aluminum alloy reacts 230 min, hydrogen production is 1200 mL, and the conversion rate is 97.1%. The reason that the hydrogen production properties of Al-3Ga-3In-3Sn alloy are improved can be ascribed to the following three factors. Firstly, with adding AlTi5B, the average grain sizes of the aluminum alloy are refined from columnar crystals with an average size of 70 μm to equiaxed crystals with an average size of 30 μm. The grain boundary areas increase significantly， which results in the increase of volume fraction of Ga-In-Sn eutectic alloy (GIS) phase. Secondly, a low melting point GIS grain boundary phase was present in Al-3Ga-3In-3Sn-0.1% AlTi5B due to the addition of AlTi5B. When the reaction temperature of the aluminum alloy is higher than the melting point of the GIS phase, the GIS phase changes to the liquid state. The liquid GIS phases not only provide a channel for the reaction of aluminum atoms with water, but also protect the aluminum atoms from oxidation, thereby promoting the reaction of aluminum alloy and water. Thirdly, the open circuit voltage of aluminum alloy decreased with adding 0.1% AlTi5B, which indicates that the activity of Al-3Ga-3In-3Sn-0.1% AlTi5B alloy is improved. The reduction of open circuit voltage is beneficial to the reaction of aluminum alloy with water.