在工业中，镀锌板是比较常见的设备，广泛用于建筑、家电、车船、容器制造业、机电业等行业。那么在使用镀锌板进行加工时，出现发黑情况是由哪些原因造成呢？接下来就由济南镀锌板带您来了解一下：

In the industry, galvanized sheet is a common equipment, widely used in construction, household appliances, vehicles and ships, container manufacturing, mechanical and electrical industry and other industries. So, in the use of galvanized steel processing, appear blackening is caused by what reason? Next, Jinan galvanized sheet will take you to know:

造成镀锌板加工发黑原因介绍

Causes of blackening of galvanized sheet

济南镀锌板

Jinan galvanized sheet

一、纯锌镀层钢板零件表面发黑的类型

1、 Types of blackening on the surface of pure zinc coated steel plate

表面发黑常见的有两种类型：脏污类（附着于镀层表面的异物）和加工类（加工过程中造成镀层表面特性变化），当然在实际案例中这两种类型可能是同时存在的。

There are two common types of surface blackening: dirt (foreign matter attached to the surface of the coating) and processing (change of coating surface characteristics during processing). Of course, in actual cases, these two types may exist at the same time.

二、脏污类黑斑的辨识

2、 Identification of dirty black spots

脏污的来源常见的是含油锌粉类脏污，如剪切线油毡上聚集的油污。

The most common source of dirt is oily zinc dust, such as the oil accumulated on the cutting felt.

辨识：该类黑斑因为属于表面附着的异物，所以通常可通过擦拭减轻或去除。即使干了之后也能看到明显的轮廓。

Identification: this kind of black spot belongs to the foreign body attached to the surface, so it can be reduced or removed by wiping. Even when it's dry, you can see a sharp outline.

脏污类的黑斑常常可以通过观察零件样辨识。

Black spots of dirt can often be identified by observing parts.

三、加工类黑斑的辨识

3、 Identification of machining black spots

加工类的黑斑产生原因有很多，镀锌层表面因为摩擦导致粗糙度被改变，或摩擦导致锌粉堆积或热镀锌镀层氧化（受镀层成分影响）等，都可能形成黑斑形貌。

There are many reasons for black spots in processing. The surface roughness of zinc coating is changed due to friction, or zinc powder accumulation caused by friction or oxidation of hot-dip galvanized coating (affected by coating composition) may form black spot morphology.

辨识：加工类黑斑必须结合生产工艺进行分析，当发现零件出现黑斑后，首先确定零件上的规律，是整个零件均匀出现还是某个位置规律出现。

Identification: the black spots in processing must be analyzed in combination with the production process. When the black spots are found on the parts, the law on the parts should be determined first, whether the whole part appears uniformly or a certain position rule appears.

确定规律后在加工线上反向排查，找到入口没有出口出现黑斑的工序。加工类黑斑通常是由于钢板与设备摩擦导致的，调整也着重于减少夹紧装置压紧力、降低凹凸模粗糙度、改善润滑、缩短模具清理周期、调整皮带速度等方面。

After determining the law, reverse check on the processing line to find out the process without black spots at the inlet and outlet. The black spots in machining are usually caused by friction between steel plate and equipment. The adjustment also focuses on reducing the clamping force of clamping device, reducing the roughness of concave convex die, improving lubrication, shortening the cleaning cycle of mould and adjusting the belt speed.