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首页> 外文期刊>Corrosion Engineering, Science and Technology >Corrosion characteristics of electroless Ni - P coating in dichloropropanol (DCP) solution
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Corrosion characteristics of electroless Ni - P coating in dichloropropanol (DCP) solution

机译：化学镀Ni-P涂层在二氯丙醇（DCP）溶液中的腐蚀特性。

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摘要

Corrosion of reactors or heat exchangers is a major problem in industrial applications. During the industrial production of epichlorohydrin (ECH) from dichloropropanol (DCP), there are many corrosive byproducts which can severely attack heat exchangers. It is therefore important to select suitable structural materials, which are compatible with the field environment of each particular process, to ensure the long term integrity of the reactor components. The aim of the present study is to evaluate the corrosion behaviour of the electroless Ni-P coating in the DCP solution and to gain an improved understanding of the corrosion mechanism. Type 304 stainless steel (SS) was used in the present study. A parametric study was carried out to investigate the influences of the electroless Ni-P coating thickness, immersion temperature and chloride ion concentration, on the corrosion rate and corrosion morphology of the selected materials. The corrosion rate of type 304 SS was always higher than that of the electroless Ni-P coating in DCP solution. The corrosion rate of the electroless Ni-P coating decreased with its thickness firstly and then increased. Also, the electroless Ni-P coating showed better corrosion resistance than type 304 SS in DCP solution containing chloride.
机译：反应器或热交换器的腐蚀是工业应用中的主要问题。在由二氯丙醇（DCP）工业生产环氧氯丙烷（ECH）的过程中，有许多腐蚀性副产物会严重侵蚀热交换器。因此重要的是选择合适的结构材料，其与每个特定过程的现场环境兼容，以确保反应器部件的长期完整性。本研究的目的是评估DCP溶液中化学镀Ni-P涂层的腐蚀行为，并加深对腐蚀机理的了解。在本研究中使用了304型不锈钢（SS）。进行了参数研究，以研究化学镀Ni-P涂层厚度，浸入温度和氯离子浓度对所选材料的腐蚀速率和腐蚀形态的影响。 304 SS型的腐蚀速率始终高于DCP溶液中化学镀Ni-P涂层的腐蚀速率。化学镀Ni-P涂层的腐蚀速率随厚度的增加先降低后增加。同样，在含氯化物的DCP溶液中，化学镀Ni-P涂层比304 SS型具有更好的耐腐蚀性。

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