The IP68 waterproof rating is the waterproof rating standard when it leaves the factory. The waterproof rating will gradually decrease during use. If the waterproof rating has not decreased, placing the phone in seawater for a short time and drying it in time will not affect the phone, but it may accelerate the attenuation of the waterproof rating. If the phone is placed in seawater for a long time or the seawater stains are not dried and left in the gaps for a long time, it is easy to cause the phone's materials to corrode and water or liquid to enter.
Seawater is an electrolyte solution containing a variety of salts and a certain amount of oxygen. It is easy to react electrolytically with the metal material of the phone, so it is easy to cause oxidation corrosion of the metal material.
It is recommended not to put the phone in seawater. Even if there may be no water or liquid ingress at the time, it will cause the product's waterproof rating to decrease.