铁基SiN表面陶瓷的结构及耐酸性腐蚀行为

Structure of Iron Based Surface Silicon Nitride Ceramics and ITS Corrosion Resistant Behaviors To Acid Solution

研究了铁基表面镀硅（～５０ｎｍ 厚）经氮离子束处理（能量为 ４０ｋｅ Ｖ，剂量分别为５×１０１６，１×１０１７，５×１０１７ｃｍ － ２）后的表面结构和在 １ Ｎ Ｈ２ Ｓ Ｏ４ 水溶液中的腐蚀行为。 Ｔ Ｅ Ｍ 证明，各试样表面均存在一完整的非晶层；电化学测量和失重实验表明，试样的失重量与浸泡时间满足幂函数规律；经表面处理过的试样，腐蚀电位提高了 ３０～４０ｍ Ｖ，腐蚀电流密度下降了 ４～６ 倍；耐腐蚀性随氮离子剂量的增大而不断提高。文章还结合腐蚀表面的粗糙度（分形维数）讨论了离子注入对表面结构和耐蚀性的影响。

The surface structure and it's corrosion behavior in 1N H 2SO 4 solution,for the pure iron deposited with silicon(～50nm)and bombarded with nitrogen ion (energy:40keV,dose:5×10 16 ,1×10 17 ,5×10 17 cm -2 respectively),were investigated by the methods of polarization electrochemistry,and mass loss with the help of atomic absorption spectroscopy for measuring the dissolved weight in solution as a function of soaking time.It has been shown that the cumulative mass loss is the power function of time,compared with the pure iron sample without treatment,the corrosion potential increases by 30～40mV,and the corrosion rate and corrosion current density are 4～6 times lower for the samples with cermet coating;the corrosion resistance increases with the dose increasing. TEM examination shows that integrated amorphous layer was formed but no second phase was found for the treated samples.