ASTM G96-90(2013)
Standard Guide for Online Monitoring of Corrosion in Plant Equipment (Electrical and Electrochemical Methods)

Standard No.

ASTM G96-90(2013)

Release Date

1990

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM G96-90(2018)

Latest

ASTM G96-90(2018)

Scope

5.1 General corrosion is characterized by areas of greater or lesser attack, throughout the plant, at a particular location, or even on a particular probe. Therefore, the estimation of corrosion rate as with mass loss coupons involves an averaging across the surface of the probe. Allowance must be made for the fact that areas of greater or lesser penetration usually exist on the surface. Visual inspection of the probe element, coupon, or electrode is required to determine the degree of interference in the measurement caused by such variability. This variability is less critical where relative changes in corrosion rate are to be detected.

5.2 Both electrical test methods described in this guide provide a technique for determining corrosion rates without the need to physically enter the system to withdraw coupons as required by the methods described in Guide G4.

5.3 Test Method B has the additional advantage of providing corrosion rate measurement within minutes.

5.4 These techniques are useful in systems where process upsets or other problems can create corrosive conditions. An early warning of corrosive attack can permit remedial action before significant damage occurs to process equipment.

5.5 These techniques are also useful where inhibitor additions are used to control the corrosion of equipment. The indication of an increasing corrosion rate can be used to signal the need for additional inhibitor.

5.6 Control of corrosion in process equipment requires a knowledge of the rate of attack on an ongoing basis. These test methods can be used to provide such information in digital format easily transferred to computers for analysis.

TEST METHOD A—ELECTRICAL RESISTANCE (1-6)⁴

1.1 This guide covers the procedure for conducting online corrosion monitoring of metals in plant equipment under operating conditions by the use of electrical or electrochemical methods. Within the limitations described, these test methods can be used to determine cumulative metal loss or instantaneous corrosion rate, intermittently or on a continuous basis, without removal of the monitoring probes from the plant.

1.2 The following test methods are included: Test Method A for electrical resistance, and Test Method B for polarization resistance.

1.2.1 Test Method A provides information on cumulative metal loss, and corrosion rate is inferred. This test method responds to the remaining metal thickness except as described in Section 5.

1.2.2 Test Method B is based on......

ASTM G96-90(2013) Referenced Document

• ASTM D1125 Standard Test Methods for Electrical Conductivity and Resistivity of Water*， 1995-04-20 Update
• ASTM G1 Standard Practice for Preparing, Cleaning, and Evaluating Corrosion Test Specimens*， 1999-01-01 Update
• ASTM G102 Standard Practice for Calculation of Corrosion Rates and Related Information from Electrochemical Measurements
• ASTM G15 Standard Terminology Relating to Corrosion and Corrosion Testing*， 1999-04-20 Update
• ASTM G3 Standard Practice for Conventions Applicable to Electrochemical Measurements in Corrosion Testing
• ASTM G4 Standard Guide for Conducting Corrosion Coupon Tests in Field Applications*， 1995-04-20 Update
• ASTM G59 Standard Test Method for Conducting Potentiodynamic Polarization Resistance Measurements*， 1997-04-20 Update

ASTM G96-90(2013) history

• 2018 ASTM G96-90(2018) Standard Guide for Online Monitoring of Corrosion in Plant Equipment (Electrical and Electrochemical Methods)
• 1990 ASTM G96-90(2013) Standard Guide for Online Monitoring of Corrosion in Plant Equipment (Electrical and Electrochemical Methods)
• 1990 ASTM G96-90(2008) Standard Guide for Online Monitoring of Corrosion in Plant Equipment (Electrical and Electrochemical Methods)
• 1990 ASTM G96-90(2001)e1 Standard Guide for On-Line Monitoring of Corrosion in Plant Equipment (Electrical and Electrochemical Methods)
• 1990 ASTM G96-90(1996)E1 Standard Guide for On-Line Monitoring of Corrosion in Plant Equipment (Electrical and Electrochemical Methods)