(1. 中國(guó)科學(xué)院 海洋研究所，青島 266071；
2. 中國(guó)科學(xué)院 研究生院，北京 100039)
摘 要: 采用改進(jìn)的雙面電解池檢測(cè)熱鍍鋅鋼材在恒溫30 ℃、不同濕度條件下的氫滲透電流，并結(jié)合慢應(yīng)變速率拉伸和斷口形貌分析，研究其在海洋大氣環(huán)境中的氫脆敏感性。結(jié)果表明：在相對(duì)濕度小于70%時(shí)，熱鍍鋅鋼材未檢測(cè)到明顯的氫滲透電流，但隨著濕度的增加，氫滲透電流密度逐漸增大；當(dāng)鍍層存在缺陷時(shí)，鍍鋅層在為鋼材基體提供陰極保護(hù)的同時(shí)也會(huì)促進(jìn)氫向鋼材基體中滲透，且氫滲透電流密度的最大值隨鍍層缺陷面積的增加而降低；氫吸收和氫滲透降低了熱鍍鋅鋼材的斷后伸長(zhǎng)率，導(dǎo)致其斷口切邊處出現(xiàn)少量撕裂棱，表明熱鍍鋅鋼材在高溫、潮濕的海洋大氣中使用時(shí)，其氫脆敏感性將有所提高。
關(guān)鍵字: 熱浸鍍鋅層；氫滲透；大氣腐蝕；氫脆
（1. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
2. Graduate School, Chinese Academy of Sciences, Beijing 100039, China）
Abstract:The hydrogen permeation and embrittlement behavior of hot-dip galvanized steels exposed to stimulated marine atmospheric environments with different relative humidities(RH) at 30 ℃ were investigated by hydrogen permeation current measurement with modified Devanathan-Stachurski cell, slow strain rate tensile test and scanning electron microscopy technique. The results indicate that hydrogen permeation can be negligible if RH is less than 70%. With RH rising, the permeation curves increase gradually. The hydrogen absorption is accelerated by the cathodic protection of scratched steel surface afforded by zinc coating, and hydrogen permeation flux decreases with the exposed area of steel substrate increasing. Hydrogen absorption and permeation reduce the elongation after fracture of galvanized steel specimens; some lacerated phenomena occur in the fracture fringe, indicating that galvanized steels show higher hydrogen embrittlement susceptivity when being exposed to marine atmospheric environment.
Key words: hot-dip galvanized coating; hydrogen permeation; atmospheric corrosion; hydrogen embrittlement
