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热镀锌槽钢质量好坏需要判断哪些?

来源:http://www.jnxxjm.com

【 发布于:2019-05-10 20:07:07 】


1、附着量

1. Adhesion

镀锌槽钢

Galvanized channel steel

质量好坏的断定规范及断定办法,耐蚀性主要决议于镀锌层的厚度,所以镀锌层厚度常为断定镀锌质量好坏的主要依据,镀锌层受槽钢外表的成分、组织、构造不同而有不同的反响,另外进出锌溶液的角度、速度亦有很大的影响。所以完整均一的锌层厚度,实践上不太可能。所以量测附着量绝对不能以单一点(部位)来断定,必需要量测其单位面积(㎡)均匀附着锌重(g)才有意义。

Corrosion resistance is mainly determined by the thickness of galvanized layer. Therefore, the thickness of galvanized layer is often the main basis for determining the quality of galvanized layer. The galvanized layer has different reactions depending on the composition, structure and structure of channel steel. In addition, the angle and speed of entering and leaving galvanized solution also have a great influence. Therefore, it is impossible to have a uniform zinc layer thickness in practice. Therefore, it is absolutely impossible to determine the attachment quantity by a single point (position), and it is necessary to measure the uniform attachment zinc weight (g) per unit area ().

测附着量的办法有很多种,如毁坏性的切片金相观测法、酸洗法,非毁坏性的膜厚计法、电化学法、进出货重量差估量法等。普通常用的为丈量法及酸洗法。镀层测厚仪为一应用磁场感应来量测锌层厚度最普遍省事的办法,其根本条件为槽钢外表必需平滑、完好,才可得较精确数字。故在槽钢边角处或粗糙、有角度钢件或铸件等,均不太可能会的一精确的数字。普通铁件用原铁材当归零基材,尚可得相当精确的数字,铸件就绝对不精确了。

There are many methods to measure adhesion, such as destructive slice metallographic observation, acid pickling, non-destructive film thickness gauge, electrochemical method, weight difference between incoming and outgoing, etc. Commonly used are measuring method and pickling method. Coating thickness gauge is the most common and easy way to measure the thickness of zinc layer by magnetic field induction. Its basic condition is that the appearance of channel steel must be smooth and intact so that more accurate figures can be obtained. Therefore, it is impossible to get a precise figure at the edge and corner of channel steel or rough, angular steel castings or castings. Ordinary iron castings are made of raw iron, Angelica sinensis and zero base material. Quite accurate figures can be obtained, and the castings are absolutely inaccurate.

酸洗法为正式检验报告用,最精确的办法,惟切片时必需留意上下部位的公平取舍,才可得精确数字。但其亦有缺陷,如费时甚多,复杂槽钢面积不易求得,太大件无法整个酸洗等。故充沛应用测厚仪来控制现场制程,而用酸洗法来做最后检测,就曾经足够了。

20171219787446.jpg

The acid pickling method is the most accurate method for the formal inspection report. Only when slicing, we must pay attention to the fair choice of the upper and lower parts to obtain the accurate figures. However, it also has some drawbacks, such as time-consuming, difficult to obtain the area of complex channel steel, too large parts can not be pickled as a whole, and so on. Therefore, it is sufficient to use thickness gauge to control the on-site process, and acid pickling method to do the final detection.

2、均一性

2. Uniformity

热浸镀锌槽钢最易生锈的部位,仍是锌层最薄的中央,故必要测其最薄部位能否契合规范。

Hot dip galvanized trough steel is still the thinnest center of zinc layer, so it is necessary to test whether the thinnest part of galvanized trough steel conforms to the specification.

均一性的实验法,普通都用硫酸铜实验,但此办法关于由锌层和合金层组成的镀锌层皮膜测试很有问题。此因锌层与合金层在硫酸铜实验液中的溶解速度不同,合金层中也因锌/铁的比率差别而不同。所以,以一定浸渍时间的重复次数来断定平均性并不是很合理。

The homogeneity test method is usually copper sulphate test, but this method is very problematic for the test of zinc coatings and alloy coatings. Because the dissolution rate of zinc layer and alloy layer in copper sulfate solution is different, the ratio of zinc to iron in alloy layer is also different. Therefore, it is not reasonable to judge the average by the repetition times of a certain soaking time.

因而,最近欧美规格及JIS中,均有废止此实验办法的倾向,以散布取代均一性,以目视或触感为主,必要时才用膜厚计检查散布状态。

Therefore, in recent European and American specifications and JIS, there has been a tendency to abolish this experimental method, replacing homogeneity with dispersion, focusing on visual or tactile sensation, and checking the dispersion status with film thickness gauge when necessary.

外形复杂的小构件因面积量测不易,不易求得均匀膜厚,有时不得不用硫酸铜实验法来做参考,但绝不能以硫酸铜实验取代附着量测定的目的。

Because the area measurement of small components with complex shape is not easy, it is not easy to obtain uniform film thickness. Sometimes the copper sulfate experiment method has to be used as a reference, but the copper sulfate experiment can never replace the purpose of adhesion measurement.

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