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彩涂钢板镀层和涂层种类及耐蚀机理

返回列表 来源: 发布日期: 2019.12.26

彩涂钢板镀层和涂层种类及耐蚀机理 

天物彩板新产品,天物粉末喷涂彩板——寿命是普通聚酯彩板的5倍,详细请拨打网站上方电话咨询

在室温下,主要的腐蚀形式是化学腐蚀和电化学腐蚀。化学腐蚀是由金属基体表面与非电解质之间的直接化学作用引起的。该反应的特征在于在衬底表面上的原子与非电解质中的氧化剂之间的直接氧化还原反应形成腐蚀产物。电化学腐蚀是由金属基体表面与离子导电电解液之间的电化学反应引起的。任何由电化学机制进行的腐蚀反应都包括至少一个阳极和一个阴极反应,电路是由金属基体中的电子流和电解液中的离子形成的。电化学腐蚀是一种常见的腐蚀。金属在大气、海水、土壤和各种电解质溶液中的腐蚀属于这一类。
控制和保护金属腐蚀的方法有很多种,其中在金属薄板中,通常采用涂层的方法来防止钢受到外部介质的腐蚀。这些涂层主要分为金属涂层和非金属涂层。

抗腐蚀彩涂板生产定制厂家_粉末喷涂彩板抗腐蚀效果_天物粉末喷涂彩板
宝钢青山灰涂辊质量
建筑彩涂基板的镀锌产品有两种:电镀和合金镀层。它们的性能差异和应用如下:
热浸镀锌
这里的热镀锌是指在建筑中广泛使用的热镀锌纯锌。在用作彩涂基板之前,它已经在建筑业得到了广泛的应用。目前,它是建筑用彩涂板的主要类型。耐腐蚀性好。适用于制作建筑外墙板。它可用于一般成形、冲压、深冲等各级加工。
热浸镀铝
产品涂层成分为铝55%,硅1.5%,锌43.5%。具有优异的耐大气腐蚀性能,是镀锌板的2-6倍,耐腐蚀性能优异。耐高温腐蚀,表面光滑,外观良好,但涂层的成形性和焊接性稍差。适用于制作建筑外墙板,可进行一般成型、机械咬口等加工。
热镀锌铝
涂层由5%铝、0.1%混合稀土元素和其余锌组成。其特点是镀层具有良好的成形性,耐大气腐蚀性能是热镀锌板的2-3倍。良好的涂层和焊接性能。与热浸镀铝锌钢板相比,锌花较小,使用较少。

At room temperature, the main corrosion forms are chemical corrosion and electrochemical corrosion. Chemical corrosion is caused by the direct chemical interaction between the metal substrate surface and the non electrolyte. The reaction is characterized by the direct oxidation-reduction reaction between the atoms on the substrate surface and the oxidants in the non electrolyte to form corrosion products. Electrochemical corrosion is caused by the electrochemical reaction between the metal substrate surface and the ionic conducting electrolyte. Any corrosion reaction carried out by electrochemical mechanism includes at least one anode and one cathode reaction, and the circuit is formed by the electron flow inside the metal substrate and the ions in the electrolyte. Electrochemical corrosion is common and common corrosion. The corrosion of metals in the atmosphere, seawater, soil and various electrolyte solutions belongs to this category.

There are many ways to control and protect the metal corrosion, among which the way to prevent the steel from the external medium by coating is common in the sheet metal. These coatings are mainly divided into metal coating and non-metal coating.
Baosteel Qingshan gray color coated roll - quality
There are two kinds of galvanizing products for building color coated baseplate: plating and alloy coating. Their performance differences and applications are as follows:
Hot dip galvanizing
The hot-dip galvanizing here refers to the hot-dip pure zinc, which is widely used in construction. It has been widely used in the construction industry before it was used as the color coated base plate. At present, it is the main type of color coated base plate for construction. Good corrosion resistance. It is suitable for making building exterior board. It can be used for general forming, stamping, deep stamping and other levels of processing.
Hot dip aluminizing
The coating composition of the product is about 55% aluminum, 1.5% silicon, the rest is zinc (43.5%). It is characterized by excellent atmospheric corrosion resistance, 2-6 times of that of galvanized sheet, and excellent corrosion resistance. It also has high temperature corrosion resistance, smooth surface and good appearance, but the forming and weldability of the coating is slightly poor. It is suitable for making building exterior board, and can be processed in general molding, mechanical bite and other levels.
Hot dip galvanized aluminum
The coating consists of 5% aluminum, 0.1% mixed rare earth elements and the rest of zinc. Its characteristic is that the coating has good formability, and its atmospheric corrosion resistance is 2-3 times of that of hot-dip galvanized sheet. Good coating and welding performance. Compared with hot-dip aluminized zinc steel plate, zinc flower is small and seldom used.
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