A form of corrosion that can occur at the junction of dissimilar metals when they are joined together in a suitable electrolyte is __________.

Sulfidation of iron-based alloys usually begins at metal temperatures above _____.

The presence of _________ can destabilize the scale and turn it into a nonprotective scale.

With HF acid corrosion, oxygen contamination _________ the corrosion rate of carbon steel and promotes accelerated corrosion and SCC of Alloy 400.

Hydrochloric acid corrosion is a general and localized corrosion and is very aggressive to most common materials of construction. Damage in refineries is often associated with dew point corrosion in which vapors containing _______ and hydrogen chloride condense from the overhead stream of a distillation, fractionation, or stripping tower.