2017
DOI: 10.5006/2545
|View full text |Cite
|
Sign up to set email alerts
|

Magnesium and Magnesium Oxide Primer on AA2024-T351: Assessment of Field Performance

Abstract: A Mg-rich primer (MgRP) consisting of metallic magnesium pigment was developed for the protection of AA2024-T351. 1-10 Both a MgRP and a MgO-rich primer (MgORP) with topcoats were tested in laboratory primer cycle test and long-term field exposure conditions to evaluate coating barrier properties, scribe protection, and sacrificial anode-based cathodic protection in the case of MgRP. Results show that detectable amounts of Mg pigment in MgRP is preserved through 4.25 y of field exposure. Furthermore, cathodic … Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
2
1
1
1

Citation Types

0
24
0

Year Published

2018
2018
2024
2024

Publication Types

Select...
5
2

Relationship

1
6

Authors

Journals

citations
Cited by 15 publications
(24 citation statements)
references
References 19 publications
0
24
0
Order By: Relevance
“…The specific mechanisms through which MgRPs operate are not fully understood. Research findings demonstrate synergistic impacts through several chemical mechanisms (i.e., pH buffering upon Mg 2+ diffusion to the exposed substrate as well as MgO formation, which has been supported through tests on MgO-rich primers) (Santucci et al, 2017a(Santucci et al, ,b, 2018a, galvanic mechanisms (the galvanic couple potential achieved as Mg pigment volume concentration (PVC) is adjusted) (King and Scully, 2011;King et al, 2014aKing et al, , 2015, as well as possible coating and corrosion product secondary impedance effects (Nanna and Bierwagen, 2004;Krieg et al, 2012;Stoulil et al, 2015). Of course, MRPs may also cause rather than delay substrate degradation if not properly designed.…”
Section: Introductionmentioning
confidence: 66%
See 2 more Smart Citations
“…The specific mechanisms through which MgRPs operate are not fully understood. Research findings demonstrate synergistic impacts through several chemical mechanisms (i.e., pH buffering upon Mg 2+ diffusion to the exposed substrate as well as MgO formation, which has been supported through tests on MgO-rich primers) (Santucci et al, 2017a(Santucci et al, ,b, 2018a, galvanic mechanisms (the galvanic couple potential achieved as Mg pigment volume concentration (PVC) is adjusted) (King and Scully, 2011;King et al, 2014aKing et al, , 2015, as well as possible coating and corrosion product secondary impedance effects (Nanna and Bierwagen, 2004;Krieg et al, 2012;Stoulil et al, 2015). Of course, MRPs may also cause rather than delay substrate degradation if not properly designed.…”
Section: Introductionmentioning
confidence: 66%
“…The variety of primer attributes which may affect overall performance through simple or complex relationships based on chemical inhibition, galvanic protection, FIGURE 8 | The specific choice of primer type and design for protection of specific alloys is critical. For instance, Zn-rich primers applied on high strength steel cause hydrogen embrittlement rather than mitigate this phenomenon, as shown in (A) (Santucci et al, 2017a). When spray-coated on Al substrates, Zn-rich primers may effectively mitigate hydrogen embrittlement, but only when designed to achieve low polarizability, as demonstrated by the difference between the OZRP and IOZRP fracture mitigation results in (B) (Santucci et al, 2018a).…”
Section: Optimization and Effectivenessmentioning
confidence: 99%
See 1 more Smart Citation
“…24,27,28 This effect is not unique to MgRP, as similar deposition of Mg corrosion products into remote scratches has been observed for MgO-rich primers (MgORP). 35 Though there are differences in the extent of deposition, it is clear that Mg 2+ deposition has an important effect on the protection performance of MgRP and MgORP, 35 and that the difference between laboratory and field exposure is important. The influence of the exposure environment on material performance will be explored in the next case study.…”
Section: Resultsmentioning
confidence: 99%
“…This result in chemical mechanism of redeposition of Mg 2+ ions in defect to form protective Mg(OH) 2 in high pH conditions. [53][54][55] The Mg(OH) 2 inhibits both anodic and cathodic reaction in defect with time as could be inferred from Figures 14a and 14b. Anionic species leaching from the pretreatment might also bring down the anodic activity at defect by acting as cathodic inhibitor.…”
Section: 29mentioning
confidence: 99%