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在硫氰酸钠—步法晴纶生产中,大量使用硫氰酸钠溶剂。这种无机盐溶液,对碳钢具有强腐蚀性。硫氰酸钠的碳钢设备腐蚀原因是碳钢中含有杂质渗碳体(Fe_3C)和石墨,当它与电解质溶液硫氰酸钠接触时,这些杂质的电位比铁要高,就会有电位差产生。铁为阳极,杂质Fe_3C、石墨为阴极。有电位差,就会有电流产生,阳极就溶解腐蚀,这就构成了碳钢腐蚀原电池,如图。
In sodium thiocyanate - step acrylic production, extensive use of sodium thiocyanate solvent. This inorganic salt solution, carbon steel is highly corrosive. The reason for the corrosion of the carbon steel equipment of sodium thiocyanate is that the carbon steel contains impurities such as cementite (Fe 3 C) and graphite. When it comes into contact with the electrolyte solution sodium thiocyanate, the electric potential of these impurities is higher than that of iron and there is a potential Poor produce. Iron for the anode, impurity Fe_3C, graphite cathode. A potential difference, there will be a current, the anode dissolved corrosion, which formed the carbon steel corrosion of the original battery, as shown.