Abstract

Steel parts are a kind of high recovery value product for which de-rusting is the primary step in the recycling process. Laser cleaning is a popular and effective de-rusting technique at present. However, the rust on most end-of-life/used parts is very serious, and it is difficult for laser cleaning to remove it all. Therefore, a compound cleaning method was proposed in which molten salt was first used for the pretreatment of rust, followed by laser cleaning. It was shown that the rust layer after pretreatment was much easier to remove with low laser fluence. The cleaning efficiency could be improved by at least 1.34 times, and a cleaner surface without any damage could be obtained. This was the result of the inner-to-outer cleaning effect of molten salt. The penetration into the rust layer and the decomposition of the doped organics caused the contaminant layer to be destroyed in the interior and then peeled off sheet by sheet. The composition and structure analysis indicated that the remaining rust layer was oxidized, and it became looser after molten salt cleaning, which made it easier to clean. The application of molten salt to the cleaning of rusty parts will improve de-rusting efficiency and promote the development of de-rusting techniques effectively. It provides a feasible and high-efficiency choice for de-rusting.

Graphic abstract

中文翻译：

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熔融盐预清洗和激光清洗的新型除锈方法，用于钢铁零件的回收

摘要

钢零件是一种具有高回收率的产品，除锈是回收过程中的主要步骤。激光清洁是当前流行且有效的除锈技术。但是，大多数报废/使用过的零件上的锈蚀非常严重，并且激光清洗很难将其全部清除。因此，提出了一种复合清洁方法，其中首先将熔融盐用于铁锈的预处理，然后进行激光清洁。结果表明，预处理后的锈层很容易用低激光通量去除。清洁效率可以提高至少1.34倍，并且可以获得没有任何损坏的清洁表面。这是熔融盐从内到外的清洁效果的结果。渗入锈层和掺杂有机物的分解导致污染物层在内部被破坏，然后一层又一层地剥落。组成和结构分析表明，残留的锈层被氧化，并且在熔盐清洗后变得更疏松，从而更易于清洗。将熔融盐用于生锈零件的清洁将提高除锈效率，并有效地促进除锈技术的发展。它为除锈提供了一种可行且高效的选择。将熔融盐用于生锈零件的清洁将提高除锈效率，并有效地促进除锈技术的发展。它为除锈提供了一种可行且高效的选择。将熔融盐用于生锈零件的清洁将提高除锈效率，并有效地促进除锈技术的发展。它为除锈提供了一种可行且高效的选择。

图形摘要