The use of nickel-phosphorus alloy coatings on the water coolers at the top of the atmospheric distillation column in petrochemical atmospheric and vacuum distillation units yields poor results
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The use of nickel-phosphorus alloy coatings on the water coolers at the top of the atmospheric tower in petrochemical atmospheric and vacuum distillation units does not yield good results. To address the corrosion issue of the tube bundles in carbon steel coolers, a nickel-phosphorus electroless plating method was used to provide corrosion protection for these tube bundles. The following figure shows the effect of using nickel-phosphorus plating on the constant-top water cooler. The anti-corrosion coating, after being in use for 3 years, has lost its effectiveness.
The poor corrosion resistance of nickel-phosphorus alloy coatings may be caused by the following factors: 1. Insufficient coating thickness: If the thickness of the nickel-phosphorus alloy coating is not sufficient, its corrosion-resistant properties are significantly reduced. Checking and ensuring that the coating reaches the desired thickness is key to solving this problem. 2. Coating quality issues: The composition ratio, uniformity, and adhesion of the nickel-phosphorus coating all affect its corrosion resistance. It is necessary to assess whether there are any areas of inadequate control in the production process. 3. Influence of the working environment: The type and concentration of chemical substances, as well as the working temperature, can all affect the corrosion resistance of nickel-phosphorus alloy coatings. It is necessary to analyze these factors in detail to determine whether it is required to adjust the process parameters or operating conditions. 4. Choose more suitable materials: If the corrosion prevention effect remains unsatisfactory after the above adjustments, consider using other types of corrosion-resistant materials, such as titanium-based materials or stainless steel, or employing other corrosion prevention techniques such as anodic protection. For such issues, it is recommended to conduct detailed engineering analysis and testing to find the most suitable solution. At the same time, it is also possible to consult professional experts in electroless plating or materials science to obtain more effective anti-corrosion strategies. .
The surface is covered with dirt from the outside; I can’t see any signs of corrosion