The presence of fluoride ions in the environment using electric heating tubes

The presence of fluoride ions in the environment using electric heating tubes

During the use of electric heating tubes, there is a phenomenon that makes people feel puzzled: "When the surface of stainless steel 304 has brown spots on the wires that rust," many people will find it strange. Although I bought stainless steel, why does it rust now? It must be due to the unqualified quality of the electric heating tube. In fact, this is not the case. Stainless steel can also rust in certain environments. Today, let's discuss a few factors with everyone!

1, Without solid solution treatment

After processing such as wire drawing and bending, the surface passivation film and the internal crystal structure of the stainless steel 304 pipe have been damaged; If not treated with acid pickling or other protective measures, it may also be oxidized and rust.

2, Intergranular corrosion

Materials without titanium and niobium have a natural tendency towards intergranular corrosion. Adding titanium and niobium to the material, combined with stabilization treatment, can reduce intergranular corrosion.

3, The presence of fluoride ions in the usage environment

Stainless steel 304 generally does not corrode or rust, but it can still rust when exposed to a large amount of fluoride ions. Fluoride ions are widely present in salt, seawater, sea breeze, soil, etc. Stainless steel corrodes quickly in environments with the presence of fluoride ions, even surpassing ordinary low-carbon steel.

In general, the corrosion rate of an item under sealed conditions is greater than that in an open environment. If the item is assembled from plates, the corrosion rate at the joint will be greater than that in other areas. Therefore, if the equipment is in an environment where fluoride ions are enriched, the best method is to replace the equipment material.

So when using stainless steel 304 pipes, we can pay attention to the following aspects:

1. Keep the pipes clean.

2. Avoid long-term exposure of pipes to acidic and saline environments.

3. Try to prevent scratches on the surface as much as possible.

Sometimes, after using the electric heating tube for a long time, the voltage and power that were originally marked on the surface are worn off. At this time, if the electric heating tube is damaged and you want to buy the same specification but don't know the power, what should you do? Regarding this issue, the Fulan editor will tell everyone!

In fact, after the production of each electric heating tube is completed, it will have a fixed value, which is the resistance value. At this time, we can find an electric heating tube that is not yet damaged, measure the resistance value with a resistance meter, and then determine the rated voltage of a single electric heating tube based on the customer's wiring method, number of electric heating tubes, and the final working voltage.

Finally, we can calculate the power of this electric heating tube based on the formula: voltage * voltage/resistance value=power.

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