氢氧化钾在常温下腐蚀不严重，但在高温和应力作用下会严重腐蚀很多金属。钢在常温下可在稀氢氧化钠溶液中使用，但会随着温度或浓度的升高而迅速腐蚀。那么检查工业氢氧化钾的注意标准和问题理解有哪些呢？

The corrosion of potassium hydroxide is not serious under normal temperature, but it will seriously corrode many metals under high temperature and stress. Steel can be used in dilute sodium hydroxide solution at room temperature, but it will corrode rapidly with the increase of temperature or concentration. What are the standards for attention and understanding of problems in checking industrial potassium hydroxide?

工业氢氧化钾检验注意标准

Standard for inspection of industrial potassium hydroxide

以氢氧化钾矿石和硫磺为原料生产的工业氢氧化钾产品的质量检验分为出厂检验和型式检验两种。一般情况下，型式试验应每月进行一次。

The quality inspection of industrial potassium hydroxide products produced from potassium hydroxide ore and sulfur can be divided into factory inspection and type inspection. In general, the type test shall be conducted once a month.

分批检验，将每个储罐视为一个批次产品，按规定取样。每批抽取的样品总量不得少于500ml。混合后，将样品装入带有研磨塞的干净、干燥的玻璃小瓶中。瓶子上应标明生产厂家名称、产品名称、批号、类别、等级、取样日期和取样人员姓名。

For batch inspection, each storage tank shall be regarded as a batch of products and sampled as required. The total amount of samples taken from each batch shall not be less than 500ml. After mixing, the sample is placed in a clean, dry glass vial with a grinding plug. The bottle shall be marked with the name of the manufacturer, product name, batch number, category, grade, sampling date and the name of the sampling personnel.

工业氢氧化钾检验中有一项不符合要求的，一般情况下可重复抽取双份样品进行检验。产品不合格的，产品资金不得用于销售，即生产企业按照标准进行生产加工，保障客户权益。

If one item of industrial potassium hydroxide fails to meet the requirements, double samples can be taken repeatedly for inspection under normal circumstances. If the product is unqualified, the product funds shall not be used for sales, that is, the production enterprise shall carry out production and processing in accordance with national standards to protect the rights and interests of customers.

了解检查工业氢氧化钾时的问题

Understand the problems when checking industrial potassium hydroxide

氢氧化钾在常温下无腐蚀性，但在高温和应力作用下会对许多金属造成严重腐蚀。不同温度下不同浓度氢氧化钠溶液的设备和管道材料不同，氢氧化钠溶液浓度为0～30%。如果温度低于50℃，则采用I类材料制造的设备和管道一般具有耐腐蚀能力；而50～100℃的0%～30%氢氧化钠溶液对采用耐腐蚀Ⅱ类材料制成的设备和管道具有更好的性能。

Potassium hydroxide is non corrosive at room temperature, but it will cause serious corrosion to many metals under high temperature and stress. The equipment and pipeline materials with different concentrations of sodium hydroxide solution at different temperatures are different. The concentration of sodium hydroxide solution is 0 ~ 30%. If the temperature is lower than 50 ℃, the equipment and pipelines made of class I materials generally have corrosion resistance; However, 0% ~ 30% sodium hydroxide solution at 50 ~ 100 ℃ has better performance for equipment and pipelines made of corrosion-resistant class II materials.

对氢氧化钠有良好的耐腐蚀性，其次是镍。银和镍可以承受所有浓度和温度下的氢氧化钠，直熔化(480°C)。适用于高温、高浓度碱，镍及其合金（如Inconel、Monel等）是选择。不锈钢能耐40%～50%以下的NaOH溶液80～100℃，但不能耐高浓度和高温碱液。碳钢在低温稀NaOH溶液中具有良好的耐蚀性，并能在表面形成固体氧化物保护膜。由于低廉，往往是很多用户的选择。

It has good corrosion resistance to sodium hydroxide, followed by nickel. Silver and nickel can withstand sodium hydroxide at all concentrations and temperatures until melting (480 ° C). It is suitable for high temperature and high concentration alkali. Nickel and its alloys (such as Inconel, Monel, etc.) are the choice. Stainless steel can withstand 80 ~ 100 ℃ of NaOH solution below 40% ~ 50%, but can not withstand high concentration and high temperature alkaline solution. Carbon steel has good corrosion resistance in low temperature dilute NaOH solution, and can form solid oxide protective film on the surface. Because of its low price, it is often the choice of many users.

氢氧化钾不定型的原因有三：一是氢氧化钾中常见的金属离子杂质的存在会影响产品的稳定性。因此，在生产过程中，通常会加入大量的稳定剂来抑制杂质的催化作用。其次，氢氧化钾在低温下比较稳定。工业氢氧化钾加热到153℃以上会发生爆炸。第三，介质的pH值对工业氢氧化钾的稳定性影响很大。在酸性介质中，性能更稳定，氧化反应更慢。在碱性介质中，易分解。同时，在这种条件下，过量的工业氢氧化钾可以通过加热完全破坏。

There are three reasons for the amorphous potassium hydroxide: first, the presence of common metal ion impurities in potassium hydroxide will affect the stability of the product. Therefore, in the production process, a large number of stabilizers are usually added to inhibit the catalysis of impurities. Secondly, potassium hydroxide is relatively stable at low temperature. Industrial potassium hydroxide will explode when heated above 153 ℃. Third, the pH value of the medium has a great influence on the stability of industrial potassium hydroxide. In acid medium, the performance is more stable and the oxidation reaction is slower. It is easy to decompose in alkaline medium. At the same time, under this condition, excessive industrial potassium hydroxide can be completely destroyed by heating.

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