Galvanic cell type hydrogen sensors and fuel cells belong to the former, and hydrogen pump, steam electrolyzer and membrane reactors to the latter.
原电池型的氢传感器和燃料电池属于前者，氢泵、蒸汽电解器和膜反应器属于后者。
Once the FeS scale is compromised, the chance of developing a galvanic-type corrosion cell is increased.
但硫化铁膜一旦破损，就可能形成电偶型腐蚀电池。
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