Page 34 - Liquid Penetration Inspection

Diploma in Mechanical Engineering (Material)

LIQUID PENETRATION INSPECTION

www.pis.edu.my

Methods & Techniques

1. Cleaning methods

2. Etchants 2. Metal smear

3. Penetrant removal
Klein warns that acid entrapment from a pre-

4. Selection of a developer
penetrant etch can have disastrous effects on the
penetrant inspection. The article states that the

sodium hydroxide caustic often used to etch

aluminium parts does not affect penetrants but that

acids used to etch parts of other materials do have an

effect.

Kleint, R. E., Deception by Penetrants, Materials Evaluation, Vol. 45, No. 7,
July 1987, pp. 845-847, 850.

peneraju • ilmu • sejagat