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Corrosion of 6xxx Aluminum Alloys: C...

Adapala, Priyanka,

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Corrosion of 6xxx Aluminum Alloys: Compositional Effects and Galvanic Coupling with Carbon Fiber Reinforced Plastics /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Corrosion of 6xxx Aluminum Alloys: Compositional Effects and Galvanic Coupling with Carbon Fiber Reinforced Plastics // Priyanka Adapala.
Author:	Adapala, Priyanka,
Description:	1 electronic resource (194 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-07, Section: B.
Contained By:	Dissertations Abstracts International86-07B.
Subject:	Sustainability. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31867866
ISBN:	9798346880288

Corrosion of 6xxx Aluminum Alloys: Compositional Effects and Galvanic Coupling with Carbon Fiber Reinforced Plastics /
Adapala, Priyanka,

Corrosion of 6xxx Aluminum Alloys: Compositional Effects and Galvanic Coupling with Carbon Fiber Reinforced Plastics /Priyanka Adapala. - 1 electronic resource (194 pages)

Source: Dissertations Abstracts International, Volume: 86-07, Section: B.

Rising concerns related to fuel consumption and greenhouse emissions are being addressed by the automotive industry through vehicle lightweighting. Hence to meet the stringent requirements for lightweighting, conventional steel body parts are being replaced with Al alloys, Mg alloys and composite materials. However, the use of dissimilar materials together poses a serious threat of galvanic corrosion leading to accelerated degradation of galvanically coupled body parts. Aiming to develop the automotive closure panels using carbon fiber reinforced plastics (CFRP) inner and an outer aluminum alloy sheet to replace what is now an all-steel design, corrosion studies are performed to determine effective qualification of materials.In the first part of this project, CFRP materials of two types, named as twill and random, coupled with aluminum alloys (AA) 6111 and 6022 in all combinations, are subjected to a Ford laboratory accelerated cyclic corrosion test (CETP: 00.00-L-467) and on-road testing with the help of OSU campus buses for a year. The ability of the laboratory accelerated test to predict the on-road corrosion behavior is assessed by comparing the material volume loss determined using optical profilometer, microscopic images of corroded regions, and measurements of galvanic currents of the coupons exposed to the cyclic test. Analysis of the test results indicated that the coupon combination AA6111 and CFRP-random exhibits the highest corrosion susceptibility whereas AA6022 coupled with CFRP-twill is least susceptible to galvanic corrosion among the combinations used in this study.In the second part of the study, electrochemical behavioral differences between CFRP-twill and -random contributing to the differences in activities when coupled to AA6xxx are evaluated. For this, a copper deposition technique was developed to quantify the extent of electrochemical activity and identify the exact location of electrochemically active sites on the CFRP. Optimization of the deposition parameters was performed by focused ion beam sectioning and viewing the Cu deposited cross-sections in a scanning electron microscope (SEM). Quantification of the electrochemically active area was done through large area imaging by SEM and optical microscopy and image analysis. The deposited CFRP top surfaces were investigated at high magnification to evaluate polymer coverage and surface defects leading to enhanced electrochemical activity during galvanic coupling with AAs.In the final part, the corrosion behaviors of three aluminum alloys, AA6111, AA6451 and AA6016 were investigated. AA6111 containing primarily β (Al15 (Fe,Mn)3Si2) intermetallic particles (IMPs) and AA6016 containing primarily α (Al8Fe2Si) IMPs exhibited the best and the worst overall corrosion performances, respectively, as indicated by the extent of corrosion in exposure tests. However, this ranking was not predicted by standard interpretation of potentiodynamic polarization curves measured on the alloys. The corrosion susceptibilities of the three alloys were further investigated by evaluating the electrochemical behaviors of the component phases separately. Bulk analogs of the component phases were fabricated using standard alloy casting techniques. The fabricated bulk analogs of α and β IMPs as well as the three alloy matrix phases were tested using either macrocell or microcell testing. An explanation for the alloy performances was developed by combining the behavior of the component phases.

English

ISBN: 9798346880288Subjects--Topical Terms:

1029978
Sustainability.
Subjects--Index Terms:

Fuel conservation

Corrosion of 6xxx Aluminum Alloys: Compositional Effects and Galvanic Coupling with Carbon Fiber Reinforced Plastics /
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245 1 0 $a Corrosion of 6xxx Aluminum Alloys: Compositional Effects and Galvanic Coupling with Carbon Fiber Reinforced Plastics / $c Priyanka Adapala.
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520 $a Rising concerns related to fuel consumption and greenhouse emissions are being addressed by the automotive industry through vehicle lightweighting. Hence to meet the stringent requirements for lightweighting, conventional steel body parts are being replaced with Al alloys, Mg alloys and composite materials. However, the use of dissimilar materials together poses a serious threat of galvanic corrosion leading to accelerated degradation of galvanically coupled body parts. Aiming to develop the automotive closure panels using carbon fiber reinforced plastics (CFRP) inner and an outer aluminum alloy sheet to replace what is now an all-steel design, corrosion studies are performed to determine effective qualification of materials.In the first part of this project, CFRP materials of two types, named as twill and random, coupled with aluminum alloys (AA) 6111 and 6022 in all combinations, are subjected to a Ford laboratory accelerated cyclic corrosion test (CETP: 00.00-L-467) and on-road testing with the help of OSU campus buses for a year. The ability of the laboratory accelerated test to predict the on-road corrosion behavior is assessed by comparing the material volume loss determined using optical profilometer, microscopic images of corroded regions, and measurements of galvanic currents of the coupons exposed to the cyclic test. Analysis of the test results indicated that the coupon combination AA6111 and CFRP-random exhibits the highest corrosion susceptibility whereas AA6022 coupled with CFRP-twill is least susceptible to galvanic corrosion among the combinations used in this study.In the second part of the study, electrochemical behavioral differences between CFRP-twill and -random contributing to the differences in activities when coupled to AA6xxx are evaluated. For this, a copper deposition technique was developed to quantify the extent of electrochemical activity and identify the exact location of electrochemically active sites on the CFRP. Optimization of the deposition parameters was performed by focused ion beam sectioning and viewing the Cu deposited cross-sections in a scanning electron microscope (SEM). Quantification of the electrochemically active area was done through large area imaging by SEM and optical microscopy and image analysis. The deposited CFRP top surfaces were investigated at high magnification to evaluate polymer coverage and surface defects leading to enhanced electrochemical activity during galvanic coupling with AAs.In the final part, the corrosion behaviors of three aluminum alloys, AA6111, AA6451 and AA6016 were investigated. AA6111 containing primarily β (Al15 (Fe,Mn)3Si2) intermetallic particles (IMPs) and AA6016 containing primarily α (Al8Fe2Si) IMPs exhibited the best and the worst overall corrosion performances, respectively, as indicated by the extent of corrosion in exposure tests. However, this ranking was not predicted by standard interpretation of potentiodynamic polarization curves measured on the alloys. The corrosion susceptibilities of the three alloys were further investigated by evaluating the electrochemical behaviors of the component phases separately. Bulk analogs of the component phases were fabricated using standard alloy casting techniques. The fabricated bulk analogs of α and β IMPs as well as the three alloy matrix phases were tested using either macrocell or microcell testing. An explanation for the alloy performances was developed by combining the behavior of the component phases.
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653 $a Fuel conservation
653 $a Green house emissions
653 $a Galvanic corrosion
653 $a Aluminum alloys
653 $a Carbon fiber composites
653 $a Real-road exposure
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