Name: Anshan Iron and steel machinery development private enterprise machinery plant
Contact: Shen Taisheng
Mobile phone: 13942222400
Zip code: 114000
Site: Anshan Iron and steel plant
Office address: Xi min, Tiexi District, Anshan, Liaoning
No. 111 Sheng Lu
1. slot matrix treatment
Acid pickling tanks, solvent tanks and cleaning tanks must be resistant to acid or chloride corrosion. These grooves are usually made of steel or concrete to form a strong matrix groove, and then a layer of corrosion resistant material is laid on the substrate surface of the inner wall of the groove. The surface layer of matrix material should be pre-treated, and the quality of anticorrosion engineering will be directly affected by the proper treatment.
The construction of grooves with cement mortar concrete requires strong and solid, and there should be no sand, shelling, cracks, hemp and other phenomena. Surface smoothness and surface gradient should meet the design requirements as well as the requirements of construction and acceptance specifications for building anti-corrosion engineering. Yin and Yang should be made into circular or inclined planes. Before making the anticorrosive coating, the floating ash and dirt on the surface of the substrate should be cleaned and dried to a depth of 20 mm with a moisture content of not more than 6%. The treated matrix should be covered with clean fabric to prevent contamination.
The surface of steel groove should be treated before it is used as anticorrosive coating. The welding slag, burr, rust, oil stain and dust should be removed to make the surface smooth and clean and metallic luster.
Pipes, bushings, buried parts or reserved holes that pass through the anticorrosive coating shall be pre-embedded or retained in the matrix.
2. structure of anticorrosive coating
The anticorrosive coating comprises a surface layer and an isolation layer. The surface layer (including the bonding layer between the isolation layer) not only contacts the corrosion medium directly, but also bears the mechanical action. In the pretreatment of hot-dip galvanizing, steel structure parts often collide and scrape the anticorrosive coating, so the surface of the solid, wear resistance is particularly important. The isolation layer (including the leveling layer on the surface of the substrate) mainly prevents the corrosion liquid infiltrated by the surface layer from eroding the substrate.
Commonly used surface materials: when the groove to withstand a larger impact load, usually with acid-resistant brick, thick acid-resistant lump stone (granite, diabase, etc.), with steel mesh of sodium silicate concrete. When the groove is only subjected to general impact load, acid-resistant ceramic plates, water glass concrete, asphalt mortar, FRP, asphalt or resin impregnated brick can be used. Polyvinyl chloride or polypropylene board. The acid resistance of wood is not very good, but the price is low, construction, maintenance, replacement is very convenient, so it is often used as surface material, but the corresponding isolation layer requirements are higher, for example, with more than 2 mm thick FRP.
The commonly used bonding layer and pointing material are shown in table 3-3. The commonly used isolation material is shown in table 3-4.
3. heating of pickling tanks and solvent tanks.
The heating of pickling tank depends on the acid used. Sulfuric acid has the highest pickling efficiency at about 65 C. Steam is usually passed through the lead in the acid tank to heat the acid solution in a serpentine tube. If hydrochloric acid is used, there is no need for heating except cold weather.
The solvent tank can be heated by titanium or stainless steel made of steam or hot water. In recent years, using hot water PTFE (commonly known as plastic king) thin-walled thin-tube heat exchanger heating solvent, the effect is also very good.