NG pipeline needs to be covered with anti-corrosion layer and plus cathode protect, to delay its corrosion.
敷设的天然气管道表面除做防腐层外还需加入阴极保护，以延缓腐蚀速度。
2
The invention discloses a multi-element high-temperature resistant anti-shock magnetron cathode which comprises tungsten, thorium, rhenium and potassium.