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How to Choose the Right Degreaser
Key Considerations When Using a Degreaser
Before starting the degreasing process, it's essential to carefully select the appropriate degreaser and take into account several important factors. Here are some key points to consider:
**Material of the Part Being Processed**
Different metals have varying levels of resistance to corrosion in alkaline solutions. Therefore, it’s crucial to choose a degreaser with an appropriate pH level that matches the material being treated. For example, aluminum requires a less aggressive solution compared to stainless steel.
**Choosing the Right Degreaser**
The method of degreasing will influence the type of degreaser you should use. If you're using pressure spray degreasing, which has strong mechanical action and excellent cleaning performance, you need a low-foam degreaser to prevent excessive foaming. In such cases, a degreaser with high efficiency and longer contact time is recommended for optimal results.
**Type and Amount of Oil**
Understanding the nature of the oil on the surface is critical. Some oils, like animal or vegetable-based oils, can react with the surrounding medium during storage, which may affect the effectiveness of the degreasing solution. These oils are typically saponifiable, so they respond well to alkaline solutions at higher temperatures. On the other hand, mineral oils are not saponifiable and require a degreaser with strong emulsifying properties for effective removal.
**Checking the Degreasing Effect**
There are various methods to assess the effectiveness of degreasing. Common techniques include visual inspection, wiping tests, contact angle measurements, copper sulfate testing, residual oil mass analysis, colorimetric testing, and infrared spectroscopy. Among these, the water infiltration test is one of the most widely used. It involves checking the continuity of the water film on the surface after rinsing. A uniform film indicates proper degreasing. Additionally, if phosphating is part of the process, the quality of the resulting phosphate coating can also serve as an indicator—only a clean metal surface will produce a uniform and dense film.
**Consideration for Subsequent Processes**
The next steps in the process, such as pickling or phosphating, will impact the choice of degreaser. If the following step includes phosphating, especially a thin-film treatment, it’s advisable to use a low-alkalinity degreaser combined with a surface conditioning step. However, if the next stage is pickling or rust removal, a surface adjustment might not be necessary. For parts with heavy or stubborn oil deposits, manual pre-scrubbing is highly recommended. This not only improves the degreasing result but also significantly enhances the quality of the phosphating film. Pre-scrubbed surfaces tend to produce finer and denser phosphate coatings compared to those that were not pre-treated.
[Article source: Hefei Xianghe Phosphate Coating Co., Ltd. http:// ]