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Classification, Causes, and Situations of Corrosion in Thin-wall Stainless Tube

Thin-wall stainless tube is durable and has been recognized by the engineering industry. Relevant parties are currently working on reducing wall thickness and lowering prices to facilitate further promotion. Especially for small-diameter stainless capillary tube, the reliability and price of the supporting connection methods and fittings are the main factors determining their development. Developers have independently developed connection technology and fittings, making it a promising material. The Ministry of Construction and relevant departments attach great importance to this new type of tube. The promotion and application of thin-wall stainless tubes have important significance in improving the level of modern construction in the country and improving and guaranteeing water quality.

According to the corrosion principles of thin-wall stainless tubes, they can be divided into chemical corrosion and electrochemical corrosion

  • Chemical corrosion is based on the multi-phase reaction mechanism of chemistry, and the atoms on the metal surface directly interact with the molecules of the reactant (such as oxygen, water, and acid). The oxidation of the metal and the reduction of the oxidant occur simultaneously. Electrons transfer directly from the metal atoms to the acceptor, rather than being conducted separately in time or space as conjugated electrochemical reactions.

  • Electrochemical corrosion is the most common corrosion, and the vast majority of metal corrosion belongs to electrochemical corrosion. Corrosion of metals under natural conditions (such as seawater, soil, groundwater, humid atmosphere, acid rain, etc.) is usually electrochemical corrosion; most of the corrosion of thin-wall stainless tubes in engineering practice also belongs to electrochemical corrosion.

The reasons and situations of corrosion of thin-wall stainless tubes

The anti-corrosion performance of thin-wall stainless tubes is mainly due to the very thin (about 1nm) dense passivation film covering the surface. This film isolates the corrosive medium and is the basic barrier for stainless steel protection. Once the passivation film is damaged, the chemical or electrochemical reactions between the metal surface and substances such as oxygen, water, acid, alkali, salt, etc. in the atmosphere can cause discoloration or corrosion, which gradually spreads from the surface to the inside, resulting in the deterioration of the metal and the loss of its original performance. For example, during the construction process, the surface of thin-wall stainless tubes may adhere to substances containing acid, alkali, salt, etc. (such as alkaline water and lime water splashed on the decoration wall), causing local corrosion due to damage to the surface film.

Thin-wall stainless tubes are a new type of tube that emerged in the late 1990s. Due to their characteristics of safety, high strength, good corrosion resistance, durability, long service life, maintenance-free, and aesthetics, it becomes the darling of thin wall stainless steel tubes supplier and the development momentum of stainless steel water pipes is strong and they have been widely used in building water supply and drinking water pipelines.

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