In the last decade, Ruthenium–Iridium–Titanium (Ru–Ir–Ti) anodes have become a standard choice in China's electrochemical industry. Engineers value them for their high conductivity and strong resistance to chloride-induced corrosion. Compared with traditional lead-based anodes, they not only last significantly longer but also cut operating costs. In real production lines, many cells run steadily for more than 4,000 hours, a figure that was once difficult to achieve with lead systems. This is why, from Japan to Germany and across China, Ru–Ir–Ti anodes are now seen as the mainstream solution in zinc and tin electroplating.
What makes Ru–Ir–Ti anodes attractive is not just longevity. A well-prepared coating can reduce power consumption in electroplating baths and still sustain higher current density. For operators producing thick zinc or tin layers on steel strip, this combination-lower energy per unit and higher throughput-is a practical advantage. Yet, as with any electrode material, these anodes are not immune to failure. Their weak point is passivation, the moment when voltage keeps rising but current no longer flows. In practice, this is when the anode becomes inactive, forcing operators to replace or recondition it.
Passivation rarely comes from a single cause. More often, several mechanisms overlap under demanding conditions such as current densities above 150 A/m² or extended runs in high-chloride solutions. Field observations and lab tests point to a few recurring triggers:
● Coating detachment: Localized peeling exposes the titanium substrate. Once bare titanium touches the electrolyte, it quickly forms an insulating oxide, accelerating deactivation.
● RuO₂ dissolution: Even a stable Ru–Ir matrix may slowly lose ruthenium oxide into the bath, especially under fluctuating pH or during voltage spikes.
● Oxide saturation: With time, surface oxides thicken to the point of blocking active catalytic sites. This tends to occur in long campaigns where cleaning intervals are skipped.
● Micro-cracking of the coating: Thermal cycling during operation or mechanical stress during handling can generate hairline fractures. Though rarely visible, these cracks act as pathways for electrolyte penetration and gradually undermine the electrode surface.
From an operator's perspective, once passivation sets in, the options are limited-either resurface the anode or replace it altogether. Understanding these mechanisms is therefore less academic than it might seem; it directly affects plating line uptime and cost control.
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