当济南街头的铁艺大门历经风雨洗礼，表面涂层开始片片剥落，露出斑驳锈迹，不仅影响门面美观，更可能加速金属腐蚀。想要让大门重焕光彩，从清理、防锈到重新涂装，每一步都藏着修复的关键，掌握这些技巧，旧大门也能 “逆袭” 成颜值担当。

　　When the iron gates on the streets of Jinan are weathered by wind and rain, the surface coating begins to peel off in patches, revealing mottled rust, which not only affects the appearance of the storefront, but may also accelerate metal corrosion. To make the gate shine again, from cleaning, rust prevention to repainting, every step hides the key to repair. By mastering these skills, the old gate can also be transformed into a stylish and responsible one.

　　一、查明 “病因”：找准涂层脱落的根源

　　1、 Identifying the 'cause': pinpointing the root cause of coating detachment

　　涂层脱落并非偶然，济南多变的气候是 “主谋”。夏季烈日暴晒，紫外线会逐渐分解涂层中的颜料与树脂，使其变脆剥落；雨季频繁，雨水裹挟着空气中的污染物渗入涂层缝隙，加速锈蚀进程；冬季寒潮来袭，低温导致涂层热胀冷缩，产生细微裂纹，最终成片脱落。此外，若大门安装时涂层喷涂过薄、表面未彻底清洁，或使用了劣质涂料，从一开始就埋下了脱落隐患。只有摸清 “病根”，修复才能事半功倍。

　　The coating peeling off is not accidental, and the changing climate in Jinan is the "mastermind". Under the scorching summer sun, ultraviolet rays will gradually decompose the pigments and resins in the coating, making it brittle and peeling off; The rainy season is frequent, and rainwater carries pollutants from the air into the gaps of the coating, accelerating the corrosion process; The winter cold wave strikes, causing the coating to expand and shrink due to low temperatures, resulting in fine cracks and eventually falling off in patches. In addition, if the coating is sprayed too thin, the surface is not thoroughly cleaned, or inferior paint is used during the installation of the gate, it will bury the risk of detachment from the beginning. Only by identifying the root cause can we achieve twice the result with half the effort in repairing it.

　　二、前期清理：为修复打好基础

　　2、 Pre cleaning: laying a solid foundation for repair

　　修复涂层脱落的第一步，是彻底清理受损区域。先用钢丝刷或砂纸打磨剥落部位，去除松动的涂层碎片、锈迹和灰尘，使表面平整粗糙，增强新涂层附着力。对于顽固锈斑，可使用除锈剂喷涂，静置 5 - 10 分钟后用清水冲洗，再用干布擦干。若锈蚀深入金属内部，需用电动打磨机将锈迹彻底清除，直至露出光亮的金属面。清理时要注意，打磨范围应比脱落区域大出 2 - 3 厘米，确保新旧涂层过渡自然。

　　The first step in repairing coating detachment is to thoroughly clean the damaged area. First, use a wire brush or sandpaper to polish the peeled off area, remove loose coating fragments, rust, and dust, make the surface smooth and rough, and enhance the adhesion of the new coating. For stubborn rust spots, rust remover can be sprayed and left to stand for 5-10 minutes before rinsing with clean water and wiping dry with a dry cloth. If rust penetrates deep into the metal, an electric grinder is needed to thoroughly remove the rust until a shiny metal surface is exposed. When cleaning, it is important to note that the polishing area should be 2-3 centimeters larger than the peeling area to ensure a natural transition between the new and old coatings.

　　三、防锈处理：给大门穿上 “保护甲”

　　3、 Rust prevention treatment: put "protective armor" on the door

　　铁锈是铁艺大门的 “头号大敌”，清理完成后，必须进行防锈处理。选用环氧富锌底漆或醇酸防锈漆，用毛刷或喷枪均匀涂抹在打磨后的金属表面。底漆中的锌粉或防锈颜料能在金属表面形成保护膜，即使涂层后期再次破损，也能减缓锈蚀速度。底漆需涂刷 2 - 3 层，每层间隔 2 - 4 小时，确保厚度达到 60 - 80 微米。待底漆完全干燥（通常需 24 小时），方可进行下一步涂装。

　　Rust is the "number one enemy" of wrought iron gates, and after cleaning, rust prevention treatment must be carried out. Choose epoxy zinc rich primer or alkyd anti rust paint, and evenly apply it to the polished metal surface with a brush or spray gun. The zinc powder or anti rust pigment in the primer can form a protective film on the metal surface, which can slow down the corrosion rate even if the coating is damaged again in the later stage. The primer needs to be applied in 2-3 layers, with an interval of 2-4 hours between each layer, to ensure a thickness of 60-80 microns. Wait until the primer is completely dry (usually 24 hours) before proceeding to the next step of painting.

　　四、重新涂装：让大门 “穿上新衣”

　　4、 Repainting: Dress the door in new clothes

　　底漆干燥后，根据大门原有颜色和材质，选择匹配的面漆。若追求长久耐用，可选用聚氨酯面漆或氟碳漆，这类涂料耐候性强，抗紫外线、抗磨损性能出色；若预算有限，醇酸磁漆也是不错的选择。涂装前，将面漆充分搅拌均匀，若涂料过稠，可加入适量稀释剂调节至合适黏度。使用喷枪时，保持与大门表面 15 - 20 厘米的距离，以 “Z” 字形匀速移动，确保涂层均匀覆盖；若用毛刷涂刷，应顺着铁艺纹理方向，避免留下刷痕。面漆需涂刷 2 - 3 层，每层间隔 4 - 6 小时，总厚度控制在 80 - 100 微米。

　　After the primer dries, choose a matching topcoat based on the original color and material of the gate. If you pursue long-term durability, you can choose polyurethane topcoat or fluorocarbon paint. These coatings have strong weather resistance, excellent UV resistance, and wear resistance; If the budget is limited, alkyd enamel paint is also a good choice. Before painting, stir the topcoat thoroughly and evenly. If the coating is too thick, add an appropriate amount of diluent to adjust the viscosity to the appropriate level. When using a spray gun, maintain a distance of 15-20 centimeters from the surface of the door and move at a constant speed in a "Z" shape to ensure even coating coverage; If brushing with a brush, it should follow the direction of the iron texture to avoid leaving brush marks. The topcoat needs to be applied in 2-3 layers, with an interval of 4-6 hours between each layer, and the total thickness should be controlled at 80-100 microns.

　　五、细节处理：打造完美修复效果

　　5、 Detail processing: Creating a perfect repair effect

　　重新涂装后，还需对细节进行完善。对于大门的接缝处、焊接点等易积水区域，可用密封胶填充，防止水汽渗入；边角、凹槽等喷枪难以覆盖的部位，要用小毛刷补涂，确保无遗漏。涂装完成后，静置 48 - 72 小时，待涂层完全固化，期间避免触碰或淋雨。若想进一步提升防护效果，可在面漆干燥后，喷涂一层透明保护蜡或清漆，形成额外保护膜，延缓涂层老化。

　　After repainting, it is necessary to further refine the details. For areas prone to water accumulation such as the joints and welding points of the gate, sealant can be used to fill them to prevent water vapor from seeping in; The corners, grooves, and other areas that are difficult to cover with the spray gun should be repaired with a small brush to ensure no omissions. After the coating is completed, let it stand for 48-72 hours until the coating is completely cured, and avoid touching or getting wet during this period. If you want to further improve the protective effect, you can spray a layer of transparent protective wax or varnish after the topcoat is dry to form an additional protective film and delay the aging of the coating.

　　六、日常维护：预防胜于修复

　　6、 Daily maintenance: Prevention is better than repair

　　修复完成并非终点，日常保养能有效延长涂层寿命。每周用软布擦拭大门表面，清除灰尘和污渍；遇到顽固污垢，用温和的中性清洁剂稀释后擦拭，切忌使用钢丝球或腐蚀性强的清洁剂。济南雨季过后，及时擦干积水，防止铁锈滋生；冬季寒潮来临前，可喷涂一层防护剂，增强涂层抗冻性。定期检查大门涂层状况，发现小面积剥落及时修补，避免问题扩大。

　　Repair completion is not the end point, daily maintenance can effectively extend the coating life. Wipe the surface of the door with a soft cloth every week to remove dust and stains; When encountering stubborn dirt, dilute it with a mild neutral cleaner and wipe it off. Avoid using steel wire balls or highly corrosive cleaners. After the rainy season in Jinan, wipe off accumulated water in a timely manner to prevent the growth of rust; Before the arrival of winter cold waves, a layer of protective agent can be sprayed to enhance the frost resistance of the coating. Regularly inspect the coating condition of the gate and promptly repair any small areas of peeling to prevent the problem from escalating.

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