Well water contained in an AISI 304 SS pipe network for chemical treatment and posterior distribution by aerial water pi

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Well water contained in an AISI 304 SS pipe network for chemical
treatment and posterior distribution by aerial water pipes to
different locations in a food manufacturing facility was analysed.
The AISI 304 SS pipe network had an approximate 300 m length, 154
mm diameter and 2.0 mm wall thickness. The AISI 304 SS pipes were
welded using a Tungsten Inert Gas (TIG) welding procedure. In-situ
weld quality assurance was tested by pressurised WW, and no pinhole
leakage was detected. After the pipe network remained out of
service for 6 months at room temperature containing stagnant,
pressurised well water, pitting corrosion was observed on the weld
joints and the base material by the presence of multiple pinhole
leaks.
(a) Discuss, with chemical equations if relevant, TWO
corrosion events that
may have caused the pitting corrosion. (14)
(b) What practical steps could have been taken to mitigate
for this potential outcome? (2)
(c) Identify corrosion inhibition methods to mitigate for
the corrosion events identified.