Corrision inhibition of copper after 15min,immersion is ameliorrated by BTA as compared with that by MBT in concentraions below 20ppm,and is more effective with MBT at concentration above 40ppm.

• 浸泡15分钟时，在浓度低于20ppm时，BTA优于MBT； 而在40ppm时MBT优于BTA。