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一、氫氧化鉀的腐蝕特性：

1、 The corrosion characteristics of potassium hydroxide are as follows

平均腐蝕是氫氧化鉀工業(yè)消費(fèi)設(shè)備常見的腐蝕形態(tài)之一，是電化學(xué)腐蝕的根本形態(tài)，在全部暴露于介質(zhì)中的外表上平均停止，金屬平均減薄，重量逐漸減輕。

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.

石墨化腐蝕是普通鑄鐵中的石墨以網(wǎng)絡(luò)外形散布在鐵素體內(nèi)，在介質(zhì)為鹽水、礦水、土壤或極稀的酸性溶液中，發(fā)作了鐵素體選擇性腐蝕。

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.

磨損腐蝕是由于腐蝕流體和金屬外表的相對(duì)運(yùn)動(dòng)，惹起金屬的加速毀壞現(xiàn)象，它是腐蝕和磨損、化學(xué)作用和機(jī)械作用共同或交替停止的結(jié)果，其腐蝕劇烈水平遠(yuǎn)超越單一的腐蝕過程。消費(fèi)中流體通常是氣、液、固多相并存，在純堿廠呈現(xiàn)的腐蝕常見為沖刷腐蝕、沖擊腐蝕、空泡腐蝕等類型。

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.

沖刷腐蝕也稱為進(jìn)口管腐蝕，主要集中呈現(xiàn)在換熱管列管入口管端處，惹起的主要緣由是流體由大截面進(jìn)入小截面的列管中，產(chǎn)生的湍流與夾帶的結(jié)晶細(xì)粒猛烈的對(duì)管端停止沖刷，很快就把管端蝕穿氫氧化鉀沖擊腐蝕產(chǎn)生的緣由是更高流速中產(chǎn)生的一種磨損腐蝕。主要是泵等的轉(zhuǎn)動(dòng)部件；空泡腐蝕又稱穴蝕，是由于蒸汽泡的構(gòu)成和幻滅而惹起的，是由于金屬設(shè)備的幾何外形不能滿足流膂力學(xué)的請(qǐng)求，部分產(chǎn)生旋渦，氣體在壓力高時(shí)幻滅，產(chǎn)生沖擊波小孔和縫隙腐蝕是在金屬外表上產(chǎn)生小孔或縫隙的一種部分的電化學(xué)腐蝕形態(tài)。

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.