香港大学机械工程系黄铭新教授团队研发出一种新型不锈钢材料SS-H2，具有突破性的防腐蚀性能1。这种材料可在1700毫伏的电位环境下抵抗含氯腐蚀，超过水氧化反应所需的1600毫伏1，而传统不锈钢在约1000毫伏时便会发生钝态腐蚀，严重限制了其在高电压电化学应用中的使用1。SS-H2采用"顺序双钝化策略"形成铬氧化物和锰基两层保护层1。
该项成果为绿色能源领域带来重大应用前景1。SS-H2可替代昂贵的钛合金组件用于海水电解制氢1。在当前10兆瓦PEM电解槽系统中，结构组件成本约占总成本的53%，金额达1780万港元1。采用SS-H2材料可将结构材料成本降低约40倍1，使海水电解制氢的经济可行性得到显著提升。研究历时近6年，已获得两项专利授权1。团队已与大陆工厂合作开展吨级SS-H2基合金线材的生产1。相关研究成果已发表在《Materials Today》期刊上1。
Researchers at the University of Hong Kong have developed a novel stainless steel variant, designated SS-H2, that exhibits exceptional corrosion resistance in high-potential environments, marking a breakthrough that could revolutionize green hydrogen production.1 The material can withstand corrosion in chloride-rich environments at potentials up to 1,700 mV, surpassing the 1,600 mV threshold required for water oxidation reactions.1 In contrast, conventional stainless steels undergo passive corrosion at approximately 1,000 mV, restricting their utility in high-voltage electrochemical applications.1
The development by Professor Ming-Xin Huang's team leverages a "sequential dual passivation strategy" that creates two protective layers—one of chromium oxide and another of manganese-based compounds—to achieve this superior performance.1 The research process spanned nearly six years, resulting in two authorized patents.1 The advancement could reduce structural material costs by approximately 40 times in green hydrogen systems, as SS-H2 can replace expensive titanium alloy components.1 A 10-megawatt proton-exchange-membrane (PEM) electrolyzer currently costs roughly 17.8 million Hong Kong dollars, with structural components accounting for 53 percent of this expense.1 The team has already begun collaborating with mainland factories to produce ton-scale SS-H2 alloy wire materials.1 The findings have been published in the journal Materials Today.1
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