ASTM G100-89(2015)

3.1 In this test method, susceptibility to localized corrosion of aluminum is indicated by a protection potential (3.2 The breakdown (E_b), and protection potentials (E_prot) determined by the cyclic GSCP method correlate with the constant potential corrosion test (immersion-glassware) result for aluminum (1, 6, 7). When the applied potential was more negative than the GSCP E_prot, no pit initiation was observed. When the applied potential was more positive than the GSCP 3.2.1 Severe crevice corrosion occurred when the separation of E_b and 3.3 DeBerry and Viebeck (3-5) found that the breakdown potentials (3.4 If this test method is followed using the specific alloy discussed it will provide (GSCP) measurements that will reproduce data developed at other times in other laboratories.

3.5 E_b obtained are based on the results from eight different laboratories that followed the standard procedure using aluminum alloy 3003-H14 (UNS A93003). E_b and E_prot are included with statistical analysis to indicate the acceptable range.

1.1 This test method covers a procedure for conducting cyclic galvanostaircase polarization (GSCP) to determine relative susceptibility to localized corrosion (pitting and crevice corrosion) for aluminum alloy 3003-H14 (UNS A93003) 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.