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321不锈钢在pH=1的42％MgCl_2沸腾溶液中长时间浸泡后,有32ppm的氢能进入试样,并导致29％的塑性损失,但并不能产生滞后断裂。在1NH_2SO_4溶液和沸腾(146℃)LiCl溶液中动态充氢表明,如进入试样的氢量低于某个临界值,则不会产生氢致开裂.熔盐动态充氢表明,只要进入试样的氢量超过临界值并能连续供氢,则无论是321钢还是310钢,即使在160℃也能产生氢致开裂.在LiCl溶液中阳极极化,则促进应力腐蚀;阴极极化,当电流低于临界值时则能抑制应力腐蚀,如高于临界值则导致氢致开裂,321钢和310钢的动态充氢(室温或160℃)门槛值均高于应力腐蚀门槛值,断口形貌也不同。
After being soaked for a long time in 42% MgCl 2 boiling solution of pH = 1 321 stainless steel, 32 ppm of hydrogen could enter the sample and lead to 29% ductility loss but did not produce hysteresis fracture. Dynamic charge of hydrogen in 1NH_2SO_4 solution and boiling (146 ℃) LiCl solution shows that hydrogen cracking does not occur if the amount of hydrogen entering the sample is below a certain critical value. Dynamic charge of molten salt shows that as long as the sample Of the hydrogen exceeds the critical value and can be continuously supplied with hydrogen, either 321 steel or 310 steel produces hydrogen induced cracking even at 160 ° C. Anodic polarization in LiCl solution promotes stress corrosion; cathodic polarization, when When the current is lower than the critical value, the stress corrosion can be suppressed. If it is higher than the critical value, the hydrogen induced cracking will occur. The threshold values of dynamic charging hydrogen (room temperature or 160 ℃) of 321 steel and 310 steel are higher than the stress corrosion threshold. Looks different.