濟南的溫帶季風氣候給卷簾門帶來了特殊的銹蝕考驗 —— 夏季的高濕度與雨水、冬季的寒風與融雪鹽分，再加上春秋季的晝夜溫差，使得金屬卷簾門的防銹能力面臨多重挑戰。卷簾門的銹蝕并非均勻發生，而是集中在特定結構部位，這些部位的共性在于易積存水分、發生摩擦或防護層易破損，結合濟南的氣候特點，其生銹規律呈現明顯的區域性特征。

　　The temperate monsoon climate in Jinan has brought special corrosion tests to rolling shutter doors - high humidity and rain in summer, cold wind and melting salt in winter, coupled with the temperature difference between day and night in spring and autumn, make the rust prevention ability of metal rolling shutter doors face multiple challenges. The rusting of rolling shutter doors does not occur uniformly, but is concentrated in specific structural parts. The commonality of these parts is that they are prone to moisture accumulation, friction, or damage to the protective layer. Combined with the climate characteristics of Jinan, their rusting patterns show obvious regional characteristics.

　　結構縫隙與拼接處

　　Structural gaps and joints

　　卷簾門的卷軸與導軌連接的縫隙是銹蝕高發區。濟南夏季多雨，雨水順著簾片間隙滲入卷軸軸承座，若排水孔堵塞，積水會在縫隙中長期滯留。尤其是老式卷簾門的卷軸與端板焊接處，焊接點的高溫會破壞原有的鍍鋅層，形成電化學腐蝕的起點。當空氣濕度超過 70%（濟南梅雨季常達 85% 以上），縫隙中的水分會成為電解質，加速鋼鐵基材的氧化，初期表現為焊點周圍出現棕紅色銹跡，若不處理則逐漸向整個卷軸蔓延。

　　The gap between the scroll of the rolling shutter door and the guide rail is a high-risk area for corrosion. Jinan is rainy in summer, and rainwater seeps into the roller bearing seat through the gaps between the curtains. If the drainage holes are blocked, the accumulated water will remain in the gaps for a long time. Especially at the welding point between the scroll and end plate of the old-fashioned rolling shutter door, the high temperature of the welding point will damage the original galvanized layer, forming the starting point of electrochemical corrosion. When the air humidity exceeds 70% (often reaching over 85% during the rainy season in Jinan), the moisture in the gaps will become electrolytes, accelerating the oxidation of the steel substrate. Initially, it manifests as brownish red rust around the welding points, which gradually spreads throughout the entire roll if not treated.

　　簾片之間的咬合縫隙同樣易生銹。濟南春季多風，風中夾帶的沙塵會嵌入縫隙，形成磨料磨損，破壞表面涂層。當雨水滲入后，沙塵與水分混合形成糊狀物質，既阻礙涂層附著，又加速金屬氧化。對于拼接式簾片，連接螺栓的墊片與簾片接觸部位更是銹蝕重災區，墊片邊緣的微小縫隙會成為 “水阱”，在濟南的潮濕天氣里持續引發銹蝕。

　　The bite gap between the curtains is also prone to rusting. Jinan is windy in spring, and the sand and dust carried by the wind will embed into the gaps, causing abrasive wear and damaging the surface coating. When rainwater infiltrates, sand and moisture mix to form a paste like substance, which not only hinders coating adhesion but also accelerates metal oxidation. For spliced curtain panels, the contact area between the gasket of the connecting bolt and the curtain panel is particularly susceptible to corrosion. The small gaps at the edge of the gasket can become "water traps", which continue to cause corrosion in the humid weather of Jinan.

　　活動部件與受力點

　　Moving parts and force points

　　卷簾門的導軌內側是活動部件中易生銹的部位。每天的開關操作使簾片與導軌反復摩擦，濟南冬季的干燥空氣會加劇金屬間的磨損，導致導軌內側的涂層逐漸剝落。而融雪時若有鹽分濺到導軌（尤其臨街商鋪），鹽分中的氯離子會穿透殘留涂層，與鋼鐵發生反應，形成點狀銹蝕。這些銹跡會進一步增大摩擦阻力，使開關過程中產生更多劃痕，形成 “磨損 — 銹蝕 — 更嚴重磨損” 的惡性循環。

　　The inner side of the guide rail of the rolling shutter door is the most susceptible to rusting among the moving parts. The daily switch operation causes repeated friction between the curtain and the guide rail, and the dry air in winter in Jinan will intensify the wear between the metals, leading to the gradual peeling of the coating on the inner side of the guide rail. If salt splashes onto the guide rails (especially street facing shops) during snow melting, the chloride ions in the salt will penetrate the residual coating and react with the steel, forming spot rust. These rust stains will further increase the frictional resistance, causing more scratches during the switching process, forming a vicious cycle of "wear rust more severe wear".

　　彈簧組件與卷軸的連接部位也難逃銹蝕。濟南夏季的高溫會使彈簧金屬疲勞，而雨水滲入后，彈簧的伸縮運動將水分帶入深層縫隙。無論是扭簧還是卷簧，其固定端的銷軸與軸承接觸處，因長期承受扭矩力，涂層易開裂，成為銹蝕突破口。尤其在濟南多雨的 7-8 月，若維護不及時，短短兩周就可能出現明顯銹斑，影響彈簧的彈性系數。

　　The connection between the spring component and the scroll cannot escape rusting. The high temperature in Jinan during summer can cause fatigue in spring metal, and after rainwater seeps in, the spring's expansion and contraction movement brings moisture into deep cracks. Whether it is a torsion spring or a coil spring, the contact between the fixed end pin and the bearing is prone to cracking of the coating due to long-term exposure to torque forces, becoming a breakthrough point for corrosion. Especially during the rainy months of July and August in Jinan, if not maintained in a timely manner, obvious rust spots may appear in just two weeks, affecting the elasticity coefficient of the spring.

　　底部與地面接觸區域

　　Bottom to ground contact area

　　卷簾門底部的密封膠條與簾片接觸部位是銹蝕 “重災區”。濟南地勢南高北低，部分低洼區域的商鋪卷簾門底部易積水，密封膠條老化后，雨水會從縫隙滲入簾片底部。尤其是夜間溫度下降時，水汽在金屬表面凝結，形成持續潮濕環境。底部簾片的卷邊結構會成為積水槽，濟南秋季的露水會加劇這一問題，導致底部 30 厘米范圍內的簾片內側出現大面積銹蝕，表現為漆膜起泡、脫落，露出紅褐色銹層。

　　The contact area between the sealing strip at the bottom of the rolling shutter door and the curtain is a severely corroded area. The terrain of Jinan is high in the south and low in the north. In some low-lying areas, the bottom of the rolling shutter doors of shops is prone to water accumulation. After the sealing strip ages, rainwater will seep into the bottom of the curtain through the gaps. Especially when the temperature drops at night, water vapor condenses on the metal surface, forming a continuously humid environment. The rolled edge structure of the bottom curtain will become a water accumulation groove, and the autumn dew in Jinan will exacerbate this problem, causing extensive rusting on the inside of the curtain within 30 centimeters of the bottom, manifested as blistering and peeling of the paint film, exposing a reddish brown rust layer.

　　與地面直接接觸的導軌基座也易生銹。濟南老城區的部分建筑地面未做硬化處理，導軌基座直接埋入泥土中，雨季時土壤中的水分會持續侵蝕基座金屬。即使是硬化地面，若排水不暢，雨水夾帶的泥沙會在基座周圍形成淤積，使基座長期處于濕潤狀態。冬季融雪時，地面殘留的融雪劑會隨水分滲透到基座，氯離子引發的銹蝕速度是普通雨水的 3 倍以上。

　　The guide rail base in direct contact with the ground is also prone to rusting. Some buildings in the old city area of Jinan have not undergone hardening treatment, and the guide rail base is directly buried in the soil. During the rainy season, the water in the soil will continue to erode the metal of the base. Even if the ground is hardened, if the drainage is not smooth, the sediment carried by rainwater will form sedimentation around the base, keeping the base in a moist state for a long time. During winter snow melting, residual snow melting agents on the ground will penetrate into the base with water, and the corrosion rate caused by chloride ions is more than three times that of ordinary rainwater.

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