Purpose

The purpose of this study is to investigate the influence of additive particle size on the anti-corrosion behaviors of polyurethane (PU) coating.

Design/methodology/approach

The graphite (Gr) and poly-graphite (PGr) were used as large size additive and small size additive, respectively. The immersion test and electrochemical test were used to study the corrosion behaviors.

Findings

In the immersion test, the surface of the bare steel sample was corroded uniformly. However, for the steel samples with coatings, the surfaces were corroded locally. This phenomenon showed that the coating can isolate artificial sea-water and samples and then decreased the corrosion rate. Furthermore, the most severe corrosion was observed on the sample with the Gr/PU coating compared with other anti-corrosion coatings. The results of the electrochemical measurements indicated that the corrosion rate of the sample with PGr/PU coating was approximately two times lower than that of the sample with the Gr/PU coating and the sample with PGr/PU coating was hardest to be corroded.

Originality/value

To have a more objective and direct recognition of the particle size effect on the coating quality.

中文翻译：

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添加剂粒径对聚氨酯涂料防腐性能的影响

目的

这项研究的目的是研究添加剂粒度对聚氨酯（PU）涂层的抗腐蚀行为的影响。

设计/方法/方法

石墨（Gr）和聚石墨（PGr）分别用作大尺寸添加剂和小尺寸添加剂。用浸没试验和电化学试验研究了腐蚀行为。

发现

在浸渍试验中，裸钢样品的表面被均匀腐蚀。但是，对于带有涂层的钢样品，其表面局部腐蚀。这种现象表明该涂层可以隔离人造海水和样品，从而降低腐蚀速率。此外，与其他防腐蚀涂层相比，使用Gr / PU涂层的样品观察到最严重的腐蚀。电化学测量的结果表明，具有PGr / PU涂层的样品的腐蚀速率比具有Gr / PU涂层的样品的腐蚀速率低大约两倍，并且具有PGr / PU涂层的样品最不容易被腐蚀。

创意/价值

为了更客观，直接地认识粒度对涂层质量的影响。