在工業中，鍍鋅板是比較常見的設備，廣泛用于建筑、家電、車船、容器制造業、機電業等行業。那么在使用鍍鋅板進行加工時，出現發黑情況是由哪些原因造成呢？接下來就由濟南鍍鋅板帶您來了解一下：

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:

造成鍍鋅板加工發黑原因介紹

Causes of blackening of galvanized sheet

濟南鍍鋅板

Jinan galvanized sheet

一、純鋅鍍層鋼板零件表面發黑的類型

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

表面發黑常見的有兩種類型：臟污類（附著于鍍層表面的異物）和加工類（加工過程中造成鍍層表面特性變化），當然在實際案例中這兩種類型可能是同時存在的。

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、臟污類黑斑的辨識

2、 Identification of dirty black spots

臟污的來源常見的是含油鋅粉類臟污，如剪切線油氈上聚集的油污。

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

辨識：該類黑斑因為屬于表面附著的異物，所以通常可通過擦拭減輕或去除。即使干了之后也能看到明顯的輪廓。

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.

臟污類的黑斑常常可以通過觀察零件樣辨識。

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

三、加工類黑斑的辨識

3、 Identification of machining black spots

加工類的黑斑產生原因有很多，鍍鋅層表面因為摩擦導致粗糙度被改變，或摩擦導致鋅粉堆積或熱鍍鋅鍍層氧化（受鍍層成分影響）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.

辨識：加工類黑斑建議結合生產工藝進行分析，當發現零件出現黑斑后，首先確定零件上的規律，是整個零件均勻出現還是某個位置規律出現。

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.

確定規律后在加工線上反向排查，找到入口沒有出口出現黑斑的工序。加工類黑斑通常是由于鋼板與設備摩擦導致的，調整也著重于減少夾緊裝置壓緊力、降低凹凸模粗糙度、改善潤滑、縮短模具清理周期、調整皮帶速度等方面。

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.