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一、氢氧化钾的腐蚀特性：

1、 The corrosion characteristics of potassium hydroxide are as follows

平均腐蚀是氢氧化钾工业消费设备常见的腐蚀形态之一，是电化学腐蚀的根本形态，在全部暴露于介质中的外表上平均停止，金属平均减薄，重量逐渐减轻。

Average corrosion is one of the common corrosion forms of potassium hydroxide industrial consumption equipment, and is the fundamental form of electrochemical corrosion. It stops on the surface of all exposed media, the metal thins on average, and the weight gradually decreases.

石墨化腐蚀是普通铸铁中的石墨以网络外形散布在铁素体内，在介质为盐水、矿水、土壤或极稀的酸性溶液中，发作了铁素体选择性腐蚀。

Graphitization corrosion is that graphite in ordinary cast iron is dispersed in ferrite with network shape, and ferrite selective corrosion occurs in salt water, mineral water, soil or extremely dilute acid solution.

磨损腐蚀是由于腐蚀流体和金属外表的相对运动，惹起金属的加速毁坏现象，它是腐蚀和磨损、化学作用和机械作用共同或交替停止的结果，其腐蚀剧烈水平远超越单一的腐蚀过程。消费中流体通常是气、液、固多相并存，在纯碱厂呈现的腐蚀常见为冲刷腐蚀、冲击腐蚀、空泡腐蚀等类型。

Wear corrosion is caused by the relative movement of corrosion fluid and metal surface, which leads to the accelerated destruction of metal. It is the result of joint or alternating stop of corrosion and wear, chemical action and mechanical action. The severe level of corrosion is far beyond the single corrosion process. Gas, liquid and solid coexist in the consumption of fluid. The corrosion in soda ash plant is usually erosion corrosion, impact corrosion and cavitation corrosion.

冲刷腐蚀也称为进口管腐蚀，主要集中呈现在换热管列管入口管端处，惹起的主要缘由是流体由大截面进入小截面的列管中，产生的湍流与夹带的结晶细粒猛烈的对管端停止冲刷，很快就把管端蚀穿氢氧化钾冲击腐蚀产生的缘由是更高流速中产生的一种磨损腐蚀。主要是泵等的转动部件；空泡腐蚀又称穴蚀，是由于蒸汽泡的构成和幻灭而惹起的，是由于金属设备的几何外形不能满足流膂力学的请求，部分产生旋涡，气体在压力高时幻灭，产生冲击波小孔和缝隙腐蚀是在金属外表上产生小孔或缝隙的一种部分的电化学腐蚀形态。

Erosion corrosion, also known as inlet pipe corrosion, is mainly concentrated at the inlet end of heat exchange tube. The main reason is that the fluid enters into the pipe with small cross-section from large section, and the turbulence and crystal particles entrained stop scouring the pipe end violently, and the tube end is quickly eroded through. The reason of potassium hydroxide impact corrosion is a kind of wear corrosion produced in higher flow rate. Cavitation corrosion, also known as cavitation corrosion, is caused by the composition and disillusionment of steam bubbles. It is caused by the geometric shape of metal equipment that can not meet the requirements of flow mechanics. Part of the vortex is generated, and the gas is disillusioned at high pressure, resulting in shock wave. Small hole and crevice corrosion is an electrochemical corrosion form of a part that produces small holes or gaps on the surface of metal State.