Hot dip galvanizing quality inspection method

Corrosion of steel in use can not only bring great economic loss, but also cause serious accidents. Hot dip galvanizing is the most widely used surface protection method of steel at present. It is widely used in industrial production methods: batch hot galvanizing and continuous hot galvanizing. Batch hot galvanizing is mainly used in hot galvanizing production of power grid, signal tower, lamp pole, water pipe and other irregular structural parts, while continuous hot galvanizing is mainly used in regular hot galvanizing products such as steel plate and steel wire. In the process of batch hot-dip galvanization, due to its long hot plating time, and the coating is not blown, the resulting zinc layer is relatively thick, which will have a long service life. China has formulated corresponding standards for quality requirements and test methods of hot-dip galvanizing products in 1981 and 1992, GB 2694-81 and GB/ t13912-92 respectively, and further provisions were made for GB 2694 in 2003 and 2010, and GB/T13912 in 2002. Although there are relevant regulations on the requirements of hot galvanizing products and quality in each standard, there are also differences between them, and compared with foreign standards, such as Japan and ISO, the details of product quality requirements are not detailed enough. This article will introduce and discuss the new revised standards.

Before the discussion on the quality and testing methods of hot galvanizing, the general application rules and characteristics of hot galvanizing in material corrosion prevention are briefly introduced. Compared with other conventional surface protection technologies, such as organic material coating and surface plastic coating, hot galvanizing has obvious advantages in material protection, including:

1. In the process of hot galvanizing, the zinc solution and the matrix material will send out diffusion and metallurgical reaction, and form the alloy layer between the matrix material and the plating layer. The alloy layer will form metallurgical bonding with the inner matrix material and the outer zinc layer, which has high binding strength. Compared with organic coatings and other protective methods, it has higher binding strength and is not easy to peel and peel off, so that the galvanized layer can protect the matrix materials for longer.

2. With the occurrence of material corrosion, cracks or other damages will occur, which will lead to the exposure of steel matrix materials. As zinc is relatively active, corrosion of the original battery will be formed, and the coating will have the effect of sacrificing anode to protect steel. This is another advantage of hot galvanizing over other coatings

Hot  dip galvanizing is a technology that has been realized to the application stage, so the research in this aspect should be close to the application. Therefore, in the process of research, the standard should be taken as a reference appropriately, so that the research can improve the efficiency in the actual production rapidly.

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