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另一部分长期暴露在大气中，特别是水线部分，受到冲浪和水面上漂浮物的冲击，同时又受到涨潮、落潮的影响，使这部份钢结构表面经常干湿交替，特别容易生锈。现在采用线材喷锌、喷铝工艺，大大提高了钢闸门的耐蚀性，比原来采用的油漆工艺防腐年限提高5~6倍。喷锌、喷铝工艺与同类工艺性能比较(热镀锌工艺)热镀锌工艺预处理采用酸洗、磷化工艺，工件表面会有酸、碱液的残余物，留下了腐蚀的隐患，使热镀锌层容易产生脱落。
