Why is the stainless steel thermos cup rusty? (two)
Is it true that 304 stainless steel will not rust? Not too.Once, the editor took a customer to visit the workshop, and the customer found that some stainless steel liners in the waste area were rusted, and the customer was puzzled.In addition, we have been emphasizing with customers that when we produce stainless steel liners, the inside and outside are all 304 stainless steel, so the eyes of the customers at that time were full of doubts.In order to eliminate the doubts of customers, the editor specially invited a supervisor in the workshop who has produced stainless steel water cups for more than 10 years to explain to customers.
The specific reason is that 304 stainless steel needs to be welded when producing the water cup liner.The high welding power and inaccurate welding position will cause the welding position to be damaged by high temperature, and the damaged position will be oxidized and rusted when it is in contact with the moisture in the air for a long time.In order to eliminate the customer's concerns, our production supervisor took the initiative to provide the customer with the same two inner tanks, one with poor welding and one qualified.Ask the other party to take it back and put it in a humid environment for 10-15 days for observation. This is not because we artificially changed the material.The final result was exactly as the production supervisor said, the guests dispelled their doubts and cooperated with us.
316 stainless steel will also have the same problem due to the above reasons.But in addition to these reasons, there is another reason that when using stainless steel water cups made of 304 stainless steel and 316 stainless steel, do not touch liquids with high salinity and high acidity.There are standards for salt spray test and acid test for 304 stainless steel and 316 stainless steel.However, after these standards are announced, it is difficult for everyone to conduct experiments in daily life.So everyone can simply understand that once the salt concentration is high and the acid concentration is high, the surface protection layer of stainless steel will be destroyed, causing 304 stainless steel to oxidize and rust like 316 stainless steel.
Friends, when you buy stainless steel water cups, many manufacturers will clean and indicate that the water cups cannot be filled with highly corrosive liquids such as carbonated drinks and salt water, either on the instruction manual of the water cup or on the packaging box of the water cup.
Dongguan Zhanyi Commodity Technology Co., Ltd. specializes in the production of metal cups, plastic cups, coffee cups, suction mug, lunch boxes, food jar, travel mugs, portable water bottles, sports bottles, home life desktop trash cans, thermos bottles, etc.These products are all our annual exports, and are recognized and loved by the US, Europe, Australia, Japan, South Korea, Taiwan, Hong Kong and other consumers. Support for small quantity order, fast customization.
