the use of chloride ions in the environment
Chloride ions are widespread, such as salt/sweat/water/sea breeze/soil. Stainless steel in the presence of chloride ions, corrosion, and even faster than ordinary low-carbon steel.
Therefore, the use environment of stainless steel is required, and it needs to be wiped regularly to remove dust and keep it clean and dry. In the United States, there is an example: An enterprise uses an oak container to hold a solution containing chloride ions. The container has been used for nearly 100 years. It was planned to be replaced in the 1990s. Because the oak material is not modern enough, the container is replaced with stainless steel after 16 days. Leakage due to corrosion.
Second, no solution treatment
Alloying elements do not dissolve into the matrix, resulting in low matrix alloy content and poor corrosion resistance.
Third, this material that does not contain titanium and niobium has an inherent tendency to intergranular corrosion
Addition of titanium and niobium, together with a stable treatment, can reduce intergranular corrosion.
A high-alloy steel that resists corrosion in air or in chemically corrosive media. Stainless steel has an aesthetically pleasing surface and good corrosion resistance. It does not require surface treatment such as plating, and it exerts the inherent surface properties of stainless steel. A type of steel, usually called stainless steel. Representative performance of 13 chrome steel, 18-8 chromium nickel steel and other high alloy steel.
From the perspective of metallographic analysis, because the stainless steel contains chromium and forms a thin chromium film on the surface, this film separates and invades the oxygen in the steel from corrosion resistance.
In order to maintain the inherent corrosion resistance of stainless steel, steel must contain more than 12% chromium.