Why does stainless steel rust?

When brown rust spots (spots) appear on the surface of the stainless steel pipe, the customer thinks that "stainless steel is not rusty, and if it is rusty, it is not stainless steel, and there may be a problem with the steel quality."

This is a one-sided misconception about the lack of understanding of stainless steel.

Stainless steel also can get rusty under certain conditions.

Stainless steel can resist atmospheric oxidation -- that is, stainless, and also has the ability to be corroded in media containing acids, alkalis, and salts -- that is, corrosion resistance. But the size of its resistance to corrosion with the chemical constitution of its steel itself, adds mutual state, working conditions, and surrounding medium type and change. Like 304 steel pipes, in the atmosphere of dry cleansing, absolute good resistance to tarnishing ability is arranged, but it is moved on to riviera, containing the sea fog of a large number of salts, will soon get rusty; good.

Reasons for stainless steel rust:

1. Dust containing other metal elements or attachments of heterogeneous metal particles accumulate on the surface of stainless steel. In humid air, the condensed water between the attachments and stainless steel connects the two into a micro-battery, triggering an electrochemical reaction, the protective film is damaged, which is called electrochemical corrosion.

2. The surface of stainless steel adheres to acid, alkali, and salt substances (such as alkaline water and lime water splashed on the wall for decoration), causing local corrosion.

3. In polluted air (such as the atmosphere containing a large amount of sulfide, carbon oxide, and nitrogen oxide), when it encounters condensed water, it will form liquid points of sulfuric acid, nitric acid, and acetic acid, causing chemical corrosion.

To ensure that the metal surface is permanently bright and not corroded, we recommend:

1. The surface of the decorative stainless steel must be cleaned and scrubbed frequently to remove attachments and eliminate external factors that cause modification.

2. The seaside area should use 316 material stainless steel, 316 material can resist seawater corrosion.

3. The chemical composition of some stainless steel pipes on the market cannot meet the corresponding standards, and cannot meet the requirements of 304 materials. Please look for the production in KONGZO.