For saline water, why are the corrosion-resistant materials different?
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For saline water, why are the corrosion-resistant materials different? The medium is also saline; I noticed that the material used for the liquid-contacting parts of some instruments is Ti, while in others it is Ta. Is it related to concentration?
It may not need to be that precise; as long as it can adapt to the production conditions, it’s fine – they are all excellent corrosion-resistant materials. When used here, it must be able to withstand the erosion of saltwater and related elemental ions. Perhaps it’s just a difference in manufacturers and prices. Looking forward to professionals providing answers.
The choice of material has little to do with concentration; it mainly depends on the temperature and acidity of the saltwater, as well as whether it contains chlorine.
There should be relevant specifications or manuals available for reference, right?
Under electrolytic saltwater conditions, these two materials are similar. Unless the conditions change, then a different material will have to be chosen. There should be guidelines for material selection and design; you can look for them on websites, bookstores, and similar places.
It is mainly related to the quality (composition) of the salt
If it is an instrument for measuring saltwater concentration, then it is related to concentration. For concentration analysis, most manufacturers use manual titration methods; however, there are also systems for online monitoring of sodium chloride concentration, which determine the concentration level by detecting changes in conductivity. As for the electrode materials of instruments such as ORP and pH meters, I haven’t paid attention to them. The electrodes of ORP meters seem to be made of platinum, while those of pH meters are probably simpler in design, usually made of stainless steel. As for Ti and tantalum, they are less common. I’ll transfer you to the dashboard so you can see how professionals respond.
It is related to concentration; the higher the chloride concentration, the greater the corrosion intensity.
So what concentration is needed and what materials should be used? Are there any relevant materials or standards?
The last edit to this post was made by Qiu Gege Bawang on 2015-9-24 at 12:45. This question is difficult to answer for the following reasons: different types of steel exhibit varying corrosion rates at the same salt concentration, and their corrosion rates also change depending on temperature and oxygen levels. There are many combinations of factors such as material, temperature, oxygen level, and humidity that can result in the most severe form of corrosion. Generally speaking, when selecting a suitable material, you should provide all these parameters to the instrument manufacturer, who usually have software to determine the appropriate material for the lining probe
All I want to know is the material choice for the liquid-contacting part.