Uniform corrosion remedy

Corrosion rates obtained with LPR instruments provide rate data directly and within a few minutes. This instrument is well suited to applications where upsets or other accelerated corrosive conditions can be detected quickly so that remedial action can be taken. The corrosion rates obtained with the meter assume uniform corrosion with a tendency to predict pitting attack. Deposits on the electrodes can bias the pitting index value. If the index value is high, the probe should be removed and the electrode visually examined for debris. Bridging the electrodes with conductive deposits will affect both the general corrosion value and the pitting index. 

For example, the acid will uniformly corrode a piece of mild steel sheet immersed in dilute sulfuric acid. Corrosion by uniform attack accounts for the greatest loss in practice. The incidence of this kind of corrosion can easily be detected and remedial measures taken. 

So far the discussion has been limited to a consideration of homogeneous metals in a uniform environment where corrosion will occur at the same rate over the whole surface. This situation seldom constitutes a major corrosion hazard it is often possible to plan remedial work when armed with a knowledge of the uniform averaged corrosion rate expressed as a weight loss (e.g. mg dm day mdd) or a penetration rate, e.g. mm year r mpy. 

---