Regarding the issue of chloride ion content
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It is well known that chloride ions can cause corrosion of stainless steel. It is said that only free chloride ions are capable of causing corrosion in stainless steel, and calculations take into account only these free chloride ions. But apart from the free state, are there any other forms in which chloride ions can exist in a solution? ? Please, someone experienced can help me out! ! ! !
Why isn’t anyone answering? Experts from Haichuan, please help!~~~~
If the content is high, Hastelloy must be used!
The corrosion of metal materials by chloride ions is electrochemical corrosion, characterized by pitting. It seems to have nothing to do with the form. Of course, if the medium temperature is high, it will exacerbate corrosion.
Any form of corrosion must be caused by free ions; if they are in a precipitated state, then corrosion certainly will not occur. However, in general solutions, chloride ions can exist in two states: a free state and a complexed state; the corrosive ability of chloride ions may be reduced in their complexed state.
Those who know about this could please offer some guidance; I have the same question
Chlorinated organic resin solutions: Chlorine is stable and does not exist in ionic form, but it may cause swelling and corrosion of coating films due to polarity issues. Non-ionic chloride ions are present.
304/316 can be used at levels below 600 ppm; 316L is suitable for levels below 1000 ppm. For levels above 1000 ppm, duplex stainless steels such as 2205 or 2507 should be used. Fluoroplastic pumps are the best choice
Do not overlook the impact of temperature and pH value.
Yes, this is based on my experience: chloride ions are generally found in highly concentrated saline solutions and seawater, and the temperature of such media is not high, usually remaining within normal temperature ranges
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