|
| Method | Advantages | Disadvantages |
|
| Mass loss experiment | Low cost [11] | Removing corrosion products from the surface may result in inaccuracies [12] |
| An exposed surface can be provided to assess corrosion surface morphology [12] | It is dangerous to use chromic acid solution to clean corrosion products |
| Easy set-up and performance | Only an average corrosion rate is provided, and it usually varies over time [6] |
| Easy to control environment | Provides no information on corrosion mechanisms [11, 12] |
| | The ratio of surface area to medium needs to be precisely controlled, and pH is proportional to it [11] |
|
| Hydrogen evolution measurement | Low cost [11] | H2 bubbles are usually attached to the wall of the tube, leading to an |
| The results were not affected by corrosion products | Underestimate of the rate of HE [11] |
| Real-time measurement [13] | Not suitable for corrosion-resistant metals and short time experiments [11] |
| Hydrogen is produced in the human body, H2 measurement is vital [14] | Dissolution of H2 in solution affects the results [15] |
|
| pH meter | Low cost [11] | Metal hydrolysis may also affect the pH of the solution |
| Accurate detection in real time | Real-time measurement is limited by the time required for titration, which limits the evaluation of cathodic kinetics [12] |
| Easy set-up and maintain | In vitro experiments should try to avoid pH changes [11] |
|
| Potentiodynamic polarization (PDP) | Easy to prepare samples [11] | Copious HE produces ohmic potential drops that are difficult to compensate for [16] |
| The effect of chloride concentration on cathodic reaction can be provided [12] | Corrosion caused by PDP may alter surface and results during anodic scan [11] |
| Determine instantaneous corrosion rate | Tafel fitting is too simplistic to account for several processes occurring at the electrode [17] |
| Reproducible method for determination of corrosion rate | Reveal little about individual protection layers |
| Shows the difference of Ecorr and icorr of alloy with different phases [12] | Investigator variation/error can cause large differences in determined corrosion current density [12] |
|
| Electrochemical impedance Spectroscopy (EIS) | Easy to prepare samples [11] | Low-frequency measurement unsuitable for rapid-corroding samples [11] |
| Can be monitored continuously in real time | Difficult to choose a suitable equivalent circuit |
| Samples without need to be repolished after a period of time [6] | |
|
