Local Dissolution of MnS Inclusion and Microstructural Distribution of Absorbed Hydrogen in Carbon Steel
Local Dissolution of MnS Inclusion and Microstructural Distribution of Absorbed Hydrogen in Carbon Steel
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DOI：
10.1149/1.3611405
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发表时间：
2011-09
影响因子：
3.9
通讯作者：
Junichi Shinozaki;I. Muto;T. Omura;M. Numata;N. Hara
中科院分区：
文献类型：
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作者：
Junichi Shinozaki;I. Muto;T. Omura;M. Numata;N. Hara
采用微电化学极化和银装饰技术对碳钢中含有和不含有MnS夹杂物的小区域进行了研究。发现夹杂物的表面在含有10 mM NaCl的硼-硼酸盐缓冲液（pH 8.45）中在0.35至− 0.25 V（vs. SHE）的电位范围内部分溶解，而夹杂物的整个表面在低于和高于该电位范围时轻微溶解。银沉积仅发生在低于0.0 V的MnS夹杂物上和周围，这通常对应于硫化氢离子的稳定区域。当夹杂物表面部分溶解时，仅在溶解区域观察到银沉积。MnS夹杂物中的溶解物种似乎促进了吸氢反应。
Microelectrochemical polarization and silver decoration techniques were performed on a small area with and without MnS inclusions in carbon steel. The surfaces of the inclusions were found to have partially dissolved in the potential range from 0.35 to− 0.25 V (vs. SHE) in a boric-borate buffer (pH 8.45) solution with 10 mM NaCl, whereas the entire surface of the inclusions was slightly dissolved below and above this potential range. Silver deposition occurred only on and around MnS inclusions below 0.0 V, which generally corresponded to the stable region of hydrogen sulfide ions. When the inclusion surfaces were partially dissolved, silver deposition was observed only in the dissolved area. The dissolution species from MnS inclusions appeared to have promoted the hydrogen absorption reaction.