In the wave of industrialisation, the valve castings market continues to expand, and its applications are becoming increasingly widespread with the leap in manufacturing technology. However, many people in the use of valve castings, often encounter a troubling problem - casting black. What is this all about?
In the valve casting cleaning process, if the staff in the cleaning or pressure inspection link operation is not appropriate, it may trigger the casting mould, blackening phenomenon, and then accelerate the mould process, the casting surface aesthetics have a serious impact. In addition, if the selected cleaning agent has a strong corrosive, then the cleaning agent and the castings may produce a violent chemical reaction between the castings, resulting in corrosion and oxidation of the castings, and ultimately make it black. The cleanliness of the casting is likewise a key factor in determining its surface gloss. In the casting process, many manufacturers tend to ignore the casting cleaning work, or simply rinse with water, which can not achieve the desired cleaning effect. If the valve casting surface residues such as cutting fluid, saponification fluid and other corrosive substances or other stains, these will accelerate the casting long mouldy spots, blackening speed. In addition, the impact of the external environment on the valve castings should not be underestimated. In the finished product casting is completed, the manufacturer must strictly do a good job of storage management, to ensure that the temperature and humidity of the warehouse is controlled within the specified range. Because different temperature and humidity conditions may lead to different valve castings blackening.
Generally speaking, the problem of blackening of valve castings is mostly caused by oxidation. Therefore, in the production process, we must pay great attention to the problem of anti-oxidation. From cleaning, die casting, storage to transport and other aspects, we need to develop a detailed and comprehensive solution to ensure that the quality of the valve casting quality is always the same. So you should pay attention to identify the valve casting in the process of choosing valve casting, our company's valve casting, such as globe valve casting, butterfly valve casting, gate valve casting and so on are produced under strict procedures, don't worry, you can rest assured that the purchase.