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Detailed explanation of anti-corrosion of hot-dip galvanized anti-fingerprint plate

1 Principle of hot-dip galvanized anti-fingerprint board

Due to the high chemical activity, the surface of the hot-dip galvanized layer is prone to surface oxidation in the presence of fingerprints, sweat, and humid environments, which seriously affects the appearance quality. Due to the increasing requirements of the modern processing industry and consumers on the surface, the factors that may affect the appearance of the product in the production process have become the direction that many manufacturers are trying to overcome, and the demand for anti-fingerprint products has emerged as the times require. The anti-fingerprint performance of anti-fingerprint products is that the difference in light reflection intensity after coating treatment is small, forming the so-called "fingerprint resistance" in the usual sense. The main component of the chrome-free anti-fingerprint treatment agent is water-soluble organic/inorganic composite resin (acrylic resin), and the anti-fingerprint is added with water-soluble anti-rust agent (SiO2) and film-forming aid hot-dip galvanizing. Seed film layer, in which the Inhibitor component mainly reflects the corrosion resistance in the film, the reaction layer mainly plays a sealing role, the main function of resin + bridging agent is anti-fingerprint, and the lubricating layer mainly plays a lubricating role

2 Industrial trial production of anti-fingerprint board

2.1 Hot-dip galvanized anti-fingerprint product - production process and composition requirements of anti-fingerprint plate The test steel DX53D+Z is the same furnace steel. Industrial trial production process of test steel: blast furnace molten iron→converter smelting→argon blowing→continuous casting→slab feeding→slab heating→rough rolling→finish rolling→layer cooling→coiling→steel coil feeding→pickling and continuous rolling → Continuous annealing → Hot-dip galvanizing → Smoothing → Anti-fingerprint passivation → Drying → Packaging. The test steel DX53D+Z slab is heated to 1240°C in the heating furnace; the final rolling temperature is 920°C; the cooling method is used in the front section, and the coiling temperature is set to ≤730°C; 75%; galvanizing annealing soaking temperature ≤ 840 ℃, skin pass (including tension leveling) elongation ≤ 1.2%, the whole length process is stable, meeting the requirements of the control scheme.

2. 2 Trial production results and discussion

2.2.1 Corrosion resistance comparison of anti-fingerprint plate under different drying temperatures Hot air drying method is used for drying water-based anti-fingerprint coating on hot-dip galvanizing line, and the heater can heat the running strip from room temperature to 100°C; the coating The cooling section is located after the dryer and is used to cool the coated steel plate; the cooling section includes 4 cooling units, each unit is equipped with a fan and a pressure switch. The drying conditions for anti-fingerprints are mainly related to the thickness of anti-fingerprints, the speed of the production line, the temperature of the drying furnace, and the specifications of the steel plate;

The anti-fingerprint agent is composed of trial-produced latex particles and a dispersant dispersed in an aqueous solution. The ideal film-forming state is that during the drying process, the moisture and dispersant in the wet film are completely volatilized, and the latex particles are completely combined to form a dense dry film.

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Detailed explanation of anti-corrosion of hot-dip galvanized anti-fingerprint plate

Due to the high chemical activity, the surface of the hot-dip galvanized layer is prone to surface oxidation in the presence of fingerprints, sweat, and humid environments, which seriously affects the appearance quality.