What conditions should be paid attention to when stainless steel heat exchange tubes are pickled?
By: mxgy,
Zhejiang Max Stainless Steel Co., Ltd. is a modern stainless steel pipe manufacturing enterprise integrating scientific research, production and sales. The company adopts advanced, efficient and mature production management mode. The company chooses Walsin Lihwa and Yongxing Special Steel parent materials as the leading material for the production of high-quality stainless steel, providing the most reliable and safest stainless steel pipes and fittings for global users.
When it is found that the stainless steel heat exchange tubes have scale inhibition, pickling treatment can be taken. Pickling treatment can effectively remove scale inhibition, but some places need special attention. If the control is not good, it may have the opposite effect. Below, Max Stainless Steel will take you to understand what conditions should be paid attention to when stainless steel heat exchange tubes are pickled.
1. Pickling temperature
It is necessary to control the temperature of pickling, the effect of descaling is better when the temperature is high, but if the temperature is too high, the corrosion of the heat exchange tube by the pickling solution will be aggravated, it is best to control the pickling temperature at 60°.
2. Concentration of pickling solution
The concentration of the pickling solution is prepared as follows, and the cleaning effect is the best: 81.0% formic acid, 17.0% water, 1.2% buffer, and 0.8% surfactant.
3. Pickling method and time
The pickling method is carried out by combining static immersion and dynamic circulation; the pickling time is two hours of static immersion, and then three to four hours of dynamic circulation. During the pickling period, samples should be taken frequently and the pickling concentration should be tested. When the difference between the two adjacent test concentrations is less than 0.2%, it can represent the end of the pickling reaction.
4. Passivation treatment
After the pickling is completed, most of the scale and metal oxides on the surface of the stainless steel heat exchange tube will be dissolved and peeled off, exposing new metal, which is easy to be corroded, so after the pickling is completed, the stainless steel heat exchange tube should also be blunt processing.
The above are several aspects that should be controlled during pickling treatment of stainless steel heat exchange tubes.
What conditions should be paid attention to when stainless steel heat exchange tubes are pickled?
By: mxgy,
Zhejiang Max Stainless Steel Co., Ltd. is a modern stainless steel pipe manufacturing enterprise integrating scientific research, production and sales. The company adopts advanced, efficient and mature production management mode. The company chooses Walsin Lihwa and Yongxing Special Steel parent materials as the leading material for the production of high-quality stainless steel, providing the most reliable and safest stainless steel pipes and fittings for global users.
When it is found that the stainless steel heat exchange tubes have scale inhibition, pickling treatment can be taken. Pickling treatment can effectively remove scale inhibition, but some places need special attention. If the control is not good, it may have the opposite effect. Below, Max Stainless Steel will take you to understand what conditions should be paid attention to when stainless steel heat exchange tubes are pickled.
1. Pickling temperature
It is necessary to control the temperature of pickling, the effect of descaling is better when the temperature is high, but if the temperature is too high, the corrosion of the heat exchange tube by the pickling solution will be aggravated, it is best to control the pickling temperature at 60°.
2. Concentration of pickling solution
The concentration of the pickling solution is prepared as follows, and the cleaning effect is the best: 81.0% formic acid, 17.0% water, 1.2% buffer, and 0.8% surfactant.
3. Pickling method and time
The pickling method is carried out by combining static immersion and dynamic circulation; the pickling time is two hours of static immersion, and then three to four hours of dynamic circulation. During the pickling period, samples should be taken frequently and the pickling concentration should be tested. When the difference between the two adjacent test concentrations is less than 0.2%, it can represent the end of the pickling reaction.
4. Passivation treatment
After the pickling is completed, most of the scale and metal oxides on the surface of the stainless steel heat exchange tube will be dissolved and peeled off, exposing new metal, which is easy to be corroded, so after the pickling is completed, the stainless steel heat exchange tube should also be blunt processing.
The above are several aspects that should be controlled during pickling treatment of stainless steel heat exchange tubes.
