AlCl_(3)对HT700合金材料在硝酸熔盐中腐蚀行为的影响

Effect of AlCl_(3) on Corrosion Behavior of HT700 Alloy Material in Nitrate Molten Salt

为了降低合金在熔盐中的腐蚀速率,研究了AlCl_(3)对镍铁基HT700合金在Hitec熔盐中电化学腐蚀性能的影响。结果表明,1wt% AlCl_(3)的添加量,Al^(3+)的积极作用和Cl^(-)的消极作用相互影响、相互抵消,以及添加的Al元素太少,不足以与合金内部Al元素形成浓度梯度进而向内扩散保护基体,没有达到预想的效果,后期可以进一步提高硝酸盐中AlCl_(3)的浓度,或者选用其它不含Al元素的合金进一步验证AlCl_(3)的作用。

In order to reduce the corrosion rate of the alloy in the molten salt,the effect of AlCl_(3) on the electrochemical corrosion properties of a nickel-iron-based HT700 alloy in the Hitec molten salt was investigated.The results show that the amount of 1wt% AlCl_3,the positive effect of Al~(3+) and the negative effect of Cl-affects and offsets each other,and the addition of Al element is too little,not enough to form a concentration gradient with alloy internal Al element inward diffusion to protect the matrix,does not achieve the desired effect.Later can further improve the concentration of AlCl_(3) in nitrate,or choose other alloys without Al element to further verify the role of AlCl_3.