腐蚀沟纹 meaning in Chinese

corrosion grooving

And then electroplate nickel - sealing with solid particulate , which is to make micro - crack chromium when electroplating chromium again , this can avoid unsmoothness , and slower corrosion speed , as a result , improve defence performanc e
再镀一层含有固体微粒的镍封，令到再镀铬时形成微孔铬，从而防止产生大而深的直贯基体金属的少量腐蚀沟纹和凹坑，向横向发展，减缓了穿透基体的腐蚀速度，进一步提高了防护性能。