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Credibility ,Often rouge formation cannot be avoided and has to be removed during routine plant shut downs. Besides being unacceptable to the plant operators as product contamination could result, build-ups of rouge products can lead to operational problems such as blockages in filters. More severe localized 'shielding' (pitting) corrosion could also result under rouge deposits. In some cases rouge deposits can be wiped off, but abrasion should be avoided as this will result in roughening of the surfaces and may reduce the resistance to future rouge formation. Acid treatments involving 'moderate' strength nitric, phosphoric, citric and oxalic acids have been used satisfactorily. The passivating action of some of these treatments could be beneficial, but 'etching' of surfaces could result in further problems as this could reduce rouge formation resistance, due to the slight roughening of the surfaces. Electropolishing could be beneficial to re-smooth and repassivate the surfaces.
Source: Yaang Pipe Industry Co., Limited (www.yaang.com)
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