"湿度腐蚀试验" can be translated into English as "humidity corrosion test" or "moisture corrosion test".
Both translations are commonly used in the field of materials science and engineering to refer to tests conducted to evaluate the corrosion resistance of materials under humid or moist conditions. "Humidity corrosion test" is perhaps slightly more precise in emphasizing the role of humidity, while "moisture corrosion test" is broader and can encompass situations where moisture is present in various forms, not just as humidity. However, in most contexts, either translation would be acceptable and understood.