Salt spray test of stainless steel water bottle is a kind of environmental test which mainly uses artificial simulated salt spray environmental conditions created by salt spray test equipment to assess the corrosion resistance of products or metal materials.Auland is a professional stainless steel water bottle manufacturer, explaining how to perform the salt spray test.
The material of the insulation bottle, the difference between the materials, and the corrosivity of the materials.
At present, there are different grades of stainless steel materials on the market, including 201 stainless steel, 304 stainless steel, 316 stainless steel, etc.
The following are the differences between 201 and 304 stainless steels.
1. Composition: 201 stainless steel contains 15% chromium and 5% nickel. Standard 304 stainless steel with 18% chromium and 9% nickel.
2. Different corrosion resistance: 201 has high manganese content, bright surface, but easy to rust. 304 contains more chromium, the surface is dull and not easy to rust.
3. Different uses: 201 stainless steel has certain acid and alkali resistance, high density, no pinholes, and is mainly used for decorative pipes, industrial pipes and some shallow drawn products.
304 stainless steel has good processing performance and high toughness, and is commonly used in industry, furniture decoration and medical industry.
What are the resolution methods of 201 and 304
1. Visual inspection and hand touch
201 He looks very shiny and feels smooth. 304 will be darker and rough to the touch. When touching these two kinds of stainless steel with water, 304’s water stain fingerprint is easy to erase, while 201’s is not easy to erase.
2. Look at the color of pickling paste
Apply the pickling paste on the stainless steel, and observe whether the color of the stainless steel changes after a period of time. The blackening is 201, and the whitening or non discoloration is 304.
At present, the corrosion resistance test method used by our insulated bottle is to conduct salt spray test on the insulated cup. The main test steps are as follows:
1. Take the product to be tested, sodium chloride, tap water and purified water (Figure 1 and Figure 2)
2. Mix 5000g of purified water with 250g of sodium chloride, mix well, and test the PH value of the brine at 6.5-7.2. The concentration of brine is 5%, which is added from the inlet of the test drug (Fig. 3 and Fig. 4)
3. Turn on the water inlet switch of the pressure tank, add tap water into the pressure tank, fill it up, turn off the switch, and then turn on tap water. Add the water into the test box, with the water level covering 5cm of the heating pipe, and then add the water into the air tight tank around the salt spray machine. When the equipment operates normally after adding water, six alarm indicators shall be off (Fig. 5, Fig. 6, Fig. 7)
4. Check the water level, put the test products on the test rack and place them neatly at an angle of 15-30 degrees. The size of the spray can be adjusted according to the requirements of the air jet, and the collection capacity of the metering cylinder is 1-2MI/H (80m3)
Cover (Fig. 8 and 9)
5. Open the air pressure valve and adjust the air pressure to 1KG (Fig. 10)
6. Turn on the power switch, operation switch and spray switch in turn, and set the laboratory temperature of 50C and the pressure barrel temperature 63 ° C, then turn on the time switch and set the time. (The upper indicator light alarm must be checked immediately after opening. If not, add more water in case of water shortage and adjust the temperature in case of over temperature) (Figures 11 to 14)
7. Carry out the test. In the test, if you want to turn on the fogger for inspection, first turn off the spray switch and turn on the demist switch.
Reopen the lid
After the test, turn on the demist switch, take out the product, turn off all switches, and record the product test results. Normal cups will not rust after salt spray test.