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在自然界中,镁阳极以金属化合物的形式存在。精炼后,镁阳极处于从离子态到原子态的过渡状态。阴极维护的原理是金属补充电子,使金属保持过剩电子的状态,使金属达到负电位。金属原子不容易失去电子,形成溶解在溶液中的离子。镁阳极可以用来避免腐蚀。镁阳极起到了这样的作用