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Development trend and phosphating mechanism analysis of nickel-free phosphating agent

2022-12-29 08:21:49
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What is nickel-free phosphating agent? How to use it? The partner who has not used it must be confused. Let's take a look at the relevant content with Xiaobian!


Nickel-free phosphating agent is a common chemical raw material in chemical production activities. This kind of raw material can be used to produce many chemical materials. Today we will analyze the development trend of phosphating agent and the key points of phosphating mechanism. The crystal shape of the phosphating film is determined by the composition of the phosphating solution and the fluidity of the phosphating agent, while the number of crystal nuclei formed at the initial stage of the phosphating reaction determines the crystal size. Nickel added in the phosphating solution can partially deposit on the surface of the substrate in the form of metallic nickel during the initial reaction of phosphating, forming a micro anode, which can effectively reduce the crystal size of the phosphating film. However, if the composition of the phosphating solution is fixed, the crystal size depends on the surface adjustment process before phosphating.


The phosphating rate is the formation rate of the phosphating film, which can be expressed in terms of the mass of the phosphating film per unit area with time, or in terms of the porosity, or more precisely, the percentage of the anode area with the decline of the phosphating time. Therefore, the velocity constant k is only a function of temperature and activation energy, and the reaction is accelerated when the temperature increases. The activation energy is related to the chemical properties of the phosphated metal and its apparent physical state, various components of the phosphating solution and its properties. The performance of the phosphating solution is mainly determined by the oxidizing accelerator, and the phosphating is accelerated.


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