Is rust a derogatory term or a commendatory term?

Rust, an idiom in China, pinyin is xiù jbā nbā n, which means that metals such as copper and iron rust and form many spots. Rust is a chemical term, which usually refers to oxides produced on the surface of metals (including alloys), such as rust, copper rust, aluminum rust and so on.

Idiom usage:

1, gray saline-alkali soil, brown soil and rusty green shrubs constitute the foreground, while the background melts into a gray purple.

2. In the honor room, the thick coats, shoulder poles for carrying water, simple wooden saddles, lanterns, rusty telephones and other objects that border guards often wear on duty attract people's attention.

Methods to prevent rust:

1, prevent metal from contacting moisture: moisture is one of the main reasons for metal rust, so we need to avoid direct contact between metal and moisture as much as possible. The metal surface can be coated with waterproof paint, coating or wrapped with plastic film to block the contact between metal and moisture.

2. Keep the metal surface dry: In addition to preventing the metal from contacting with moisture, try to keep the metal surface dry. When there is moisture on the metal surface, it should be dried in time or accelerated by using tools such as fans to reduce the corrosive effect of moisture on the metal.

3. Use rust inhibitor: Rust inhibitor is a chemical substance that can form a protective film on the metal surface to prevent the metal from contacting with oxygen, moisture and other substances. Before using metal products, a layer of antirust agent can be coated to improve the oxidation resistance of metal.

4. Surface treatment: Metal products can be surface treated in the production process, such as zinc plating and chromium plating. These surface treatments can form a protective layer on the metal surface to block the contact between the metal and the external environment, thus reducing the possibility of rust.

5. Regular cleaning of the metal surface: Regular cleaning of the metal surface can remove impurities such as dust and oil stains attached to the metal and reduce the corrosion of the metal. When cleaning, you can use neutral detergent and soft cloth to wipe, and avoid using detergents containing acidic or alkaline substances to avoid damaging metals.