在建筑領(lǐng)域，輕型鋼結(jié)構(gòu)憑借質(zhì)輕高強(qiáng)、施工便捷等優(yōu)勢(shì)被廣泛應(yīng)用。然而，鋼結(jié)構(gòu)易受腐蝕的特性始終是影響其使用壽命與安全性的關(guān)鍵因素。尤其是在像濟(jì)南這樣四季分明、空氣濕度和污染物存在季節(jié)性變化的環(huán)境中，做好輕型鋼結(jié)構(gòu)的防腐蝕處理顯得尤為重要。深入了解腐蝕原理并采取科學(xué)有效的防腐蝕措施，是保障輕型鋼結(jié)構(gòu)長(zhǎng)期穩(wěn)定運(yùn)行的核心所在。

　　In the field of construction, lightweight steel structures are widely used due to their advantages of light weight, high strength, and convenient construction. However, the susceptibility of steel structures to corrosion remains a key factor affecting their service life and safety. Especially in environments like Jinan with distinct four seasons and seasonal variations in air humidity and pollutants, it is particularly important to carry out anti-corrosion treatment for lightweight steel structures. A deep understanding of corrosion principles and the adoption of scientifically effective anti-corrosion measures are the core to ensure the long-term stable operation of lightweight steel structures.

　　輕型鋼結(jié)構(gòu)防腐蝕處理的主要方法

　　The main methods for anti-corrosion treatment of lightweight steel structures

　　1.預(yù)處理

　　1. Preprocessing

　　高質(zhì)量的表面預(yù)處理是防腐蝕的基礎(chǔ)。首先通過(guò)機(jī)械打磨、噴砂等方式，徹底清除鋼材表面的鐵銹、氧化皮、油污等雜質(zhì)。噴砂處理能有效去除表面雜質(zhì)，同時(shí)使鋼材表面形成均勻粗糙的微觀結(jié)構(gòu)，增加后續(xù)防護(hù)涂層的附著力。打磨和噴砂處理后，需及時(shí)對(duì)鋼材進(jìn)行清潔和干燥處理，避免在空氣中再次氧化生銹，為后續(xù)的防腐涂層施工創(chuàng)造良好條件。

　　High quality surface pretreatment is the foundation of corrosion prevention. Firstly, impurities such as rust, oxide scale, and oil stains on the surface of the steel are thoroughly removed through mechanical polishing, sandblasting, and other methods. Sandblasting treatment can effectively remove surface impurities and form a uniform and rough microstructure on the steel surface, increasing the adhesion of subsequent protective coatings. After polishing and sandblasting, the steel should be cleaned and dried in a timely manner to avoid further oxidation and rusting in the air, creating favorable conditions for subsequent anti-corrosion coating construction.

　　2.防護(hù)

　　2. Protection

　　底漆涂裝：底漆直接與鋼材表面接觸，是防護(hù)的第一道屏障。富鋅底漆是常用的選擇，其含有大量鋅粉，鋅的電極電位低于鐵，當(dāng)涂層破損時(shí)，鋅優(yōu)先發(fā)生氧化反應(yīng)，從而保護(hù)鋼材不被腐蝕，起到犧牲陽(yáng)極的保護(hù)作用。環(huán)氧底漆則具有優(yōu)異的附著力和抗化學(xué)腐蝕性能，能夠有效隔絕外界腐蝕介質(zhì)與鋼材的接觸。

　　Primer coating: The primer directly contacts the surface of the steel and is the first barrier of protection. Zinc rich primer is a commonly used choice, which contains a large amount of zinc powder. The electrode potential of zinc is lower than that of iron. When the coating is damaged, zinc preferentially undergoes oxidation reaction, thus protecting the steel from corrosion and playing a sacrificial anode protection role. Epoxy primer has excellent adhesion and chemical corrosion resistance, which can effectively isolate the contact between external corrosive media and steel.

　　中間漆涂裝：中間漆主要用于增加涂層厚度，提高整體防護(hù)性能。它可以填充底漆表面的微小孔隙，增強(qiáng)涂層的致密性和抗?jié)B透能力。常用的中間漆有環(huán)氧云鐵中間漆，其片狀的云母氧化鐵顏料在涂層中相互交錯(cuò)排列，形成多層屏蔽結(jié)構(gòu)，有效阻止腐蝕介質(zhì)的滲透。

　　Intermediate paint coating: Intermediate paint is mainly used to increase coating thickness and improve overall protective performance. It can fill the tiny pores on the surface of the primer, enhancing the density and impermeability of the coating. The commonly used intermediate paint is epoxy mica iron intermediate paint, whose sheet-like mica iron oxide pigments are arranged in a staggered manner in the coating to form a multi-layer shielding structure, effectively preventing the penetration of corrosive media.

　　面漆涂裝：面漆主要起到裝飾和保護(hù)作用，提高涂層的耐候性、耐磨損性和抗紫外線性能。在濟(jì)南的戶外環(huán)境中，可選用丙烯酸聚氨酯面漆或氟碳面漆。丙烯酸聚氨酯面漆具有良好的保光保色性和耐候性，能長(zhǎng)時(shí)間保持涂層的美觀；氟碳面漆則具有超強(qiáng)的耐候性和化學(xué)穩(wěn)定性，適用于對(duì)防腐蝕和裝飾要求極高的建筑。

　　Topcoat coating: Topcoat mainly plays a decorative and protective role, improving the weather resistance, wear resistance, and UV resistance of the coating. In the outdoor environment of Jinan, acrylic polyurethane topcoat or fluorocarbon topcoat can be used. Acrylic polyurethane topcoat has good light and color retention, as well as weather resistance, which can maintain the beauty of the coating for a long time; Fluorocarbon topcoat has strong weather resistance and chemical stability, suitable for buildings with extremely high requirements for corrosion prevention and decoration.

　　3.保護(hù)技術(shù)

　　3. Protecting technology

　　犧牲陽(yáng)極保護(hù)法：在輕型鋼結(jié)構(gòu)上連接比鋼材更活潑的金屬，如鋅塊、鎂合金塊等作為犧牲陽(yáng)極。由于這些金屬的電極電位更低，在電解質(zhì)溶液中優(yōu)先發(fā)生氧化反應(yīng)，釋放電子，從而使鋼結(jié)構(gòu)成為陰極被保護(hù)起來(lái)。犧牲陽(yáng)極保護(hù)法適用于小型鋼結(jié)構(gòu)或局部防腐蝕保護(hù)，具有安裝簡(jiǎn)單、無(wú)需外加電源等優(yōu)點(diǎn)。

　　Sacrificial anode protection method: Connecting metals that are more reactive than steel, such as zinc blocks, magnesium alloy blocks, etc., on lightweight steel structures as sacrificial anodes. Due to the lower electrode potential of these metals, oxidation reactions preferentially occur in electrolyte solutions, releasing electrons and thus protecting the steel structure as a cathode. The sacrificial anode protection method is suitable for small steel structures or local anti-corrosion protection, and has the advantages of simple installation and no need for external power supply.

　　外加電流陰極保護(hù)法：通過(guò)外部直流電源，將鋼結(jié)構(gòu)與電源的負(fù)極相連，使鋼結(jié)構(gòu)成為陰極；同時(shí)在電解質(zhì)溶液中設(shè)置輔助陽(yáng)極，并與電源的正極相連。電源向鋼結(jié)構(gòu)提供電子，使其表面始終保持負(fù)電位，從而抑制腐蝕反應(yīng)的發(fā)生。外加電流陰極保護(hù)法適用于大型鋼結(jié)構(gòu)設(shè)施，如大型廠房、橋梁等，但需要專業(yè)的設(shè)備和維護(hù)管理。

　　External current cathodic protection method: By connecting the steel structure to the negative pole of an external DC power source, the steel structure becomes the cathode; Simultaneously, an auxiliary anode is set up in the electrolyte solution and connected to the positive electrode of the power supply. The power supply provides electrons to the steel structure to maintain a negative potential on its surface, thereby suppressing the occurrence of corrosion reactions. The cathodic protection method with applied current is suitable for large steel structure facilities, such as large factories, bridges, etc., but requires professional equipment and maintenance management.

　　4.防腐蝕技術(shù)應(yīng)用

　　4. Application of anti-corrosion technology

　　隨著科技發(fā)展，一些新型防腐蝕技術(shù)逐漸應(yīng)用于輕型鋼結(jié)構(gòu)。納米涂層技術(shù)通過(guò)在涂層中添加納米級(jí)材料，改善涂層的微觀結(jié)構(gòu)，提高涂層的致密性、硬度和耐腐蝕性；復(fù)合涂層技術(shù)將不同性能的涂層材料進(jìn)行復(fù)合，如將有機(jī)涂層與無(wú)機(jī)涂層復(fù)合，充分發(fā)揮各自優(yōu)勢(shì)，提升整體防腐蝕性能；自修復(fù)涂層技術(shù)則是在涂層中添加特殊物質(zhì)，當(dāng)涂層出現(xiàn)微小破損時(shí)，這些物質(zhì)能夠自動(dòng)修復(fù)破損處，恢復(fù)涂層的防護(hù)功能。

　　With the development of technology, some new anti-corrosion technologies are gradually being applied to lightweight steel structures. Nanocoating technology improves the microstructure of coatings by adding nanoscale materials, enhancing their density, hardness, and corrosion resistance; Composite coating technology combines coating materials with different properties, such as combining organic and inorganic coatings, to fully leverage their respective advantages and enhance overall corrosion resistance; Self repairing coating technology involves adding special substances to the coating, which can automatically repair minor damages and restore the protective function of the coating.

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