Why use phenolphthalein test paper to check the rinsing degree of the acid pickling passivation paste

2016-03-16View Original

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Clause 12.1.4 of HG/T 20584-2011 stipulates that in situations where the use of liquids is not convenient, it is permissible to apply an acid-washing and passivation paste for treatment; after surface treatment, the area should be rinsed thoroughly with clean water, and phenolphthalein test paper should be used to check the degree of cleaning. Upon investigation, the pickling and passivation paste is generally an *ao acid solution. Phenolphthalein test strips are generally used to detect alkaline solutions. Then why is phenolphthalein test paper used here to check the degree of rinsing off the acid pickling passivation paste? Everyone, share your opinions!

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Why use phenolphthalein test paper to check the rinsing degree of the acid pickling passivation paste

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