Creato il 08.18

Filo d'acciaio rivestito in lega di zinco-alluminio: La chiave scientifica per risolvere i dilemmi della corrosione in ambienti severi

在海岸盐雾和工业酸雨的联合侵袭下,传统的镀锌钢丝通常在3-5年内生锈并失效,而锌铝合金涂层(Zn-5%Al)钢丝的使用寿命可以延长至8-15年。其革命性的优势源于三个核心技术原则:
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"双重保护"机制
Traditional galvanizing relies solely on the sacrificial anode protection of zinc; once the zinc layer is depleted, the iron substrate corrodes rapidly.
在锌铝合金涂层中,5%铝与锌形成致密的Al-Zn-Si三元共晶相(在显微镜下呈现层状结构),同时实现:
Physical barrier: The Al₂O₃ film formed by aluminum oxidation blocks the penetration of corrosive media.
电化学保护:锌持续作为牺牲阳极,延缓基材的腐蚀。
Self-Healing Capability
当涂层表面被划伤时:
Scratches on traditional galvanized coatings undergo explosive rusting (due to exposed cathodes).
在锌铝涂层中,富锌相迅速迁移到受损区域,氧化形成新的保护膜,并阻断腐蚀路径。
抗局部腐蚀性能
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在氯离子浓度超过500ppm的沿海环境中:
镀锌层容易发生深度点蚀(腐蚀速率可达0.5mm/年)。
由于铝稳定腐蚀产物,锌铝涂层形成了一层致密的基本氯化锌保护层(Zn₅(OH)₈Cl₂),将点蚀速率抑制到0.05mm/年(按ASTM G46测量)。
Verification of Engineering Value:
A seaport guardrail in Fujian: Traditional galvanized steel wires suffered extensive rusting and breakage after 4 years of use; after replacement with zinc-aluminum alloy coated wires, only minor surface spots appeared after 8 years.
40% 减少生命周期成本:在 20 年的服务周期内,锌铝合金涂层的综合维护成本低于镀锌的成本。
Zinc-aluminum alloy coating represents a paradigm shift in corrosion control—infusing engineering with "longevity genes" through materials science.
Allen

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