Influence of the alloy microstructure and surface state on the protective properties of trivalent chromium coatings grown on a 2024 aluminium alloy
The protective properties of trivalent chromium process (TCP) coatings grown on a 2024-T3 aluminium alloy were studied on the basis of electrochemical measurements performed both in sulphate and chloride solutions and neutral salt spray tests. The influence of the alloy microstructure and surface st...
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Veröffentlicht in: | Surface & coatings technology 2018-06, Vol.344, p.276-287 |
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description | The protective properties of trivalent chromium process (TCP) coatings grown on a 2024-T3 aluminium alloy were studied on the basis of electrochemical measurements performed both in sulphate and chloride solutions and neutral salt spray tests. The influence of the alloy microstructure and surface state was studied: two batches, each one characterized by its own coarse intermetallic particle distribution, and two surface states, i.e. laminated and polished, were considered. Results showed that in 0.1 M Na2SO4, the protective properties of the TCP coatings decreased when the roughness of the initial surface increased. Furthermore, improved protective properties were observed for a TCP coating grown on a surface containing a lower amount of Al-Cu-Mg IMCs in the initial microstructure. The most plausible explanation is that a fast kinetics of coating growth, either associated to strong initial roughness or a great surface copper coverage, was detrimental for the protective properties of the coatings. In more aggressive solutions, i.e. 0.5 M NaCl solution or for neutral salt spray tests, the differences are not significant. The findings are highly relevant for industrial applications: the results showed that variations in batches, for a same type of alloy, or in initial surface state should not be detrimental for the corrosion resistance of the TCP coated samples. However, the conversion process had to be adapted for different types of alloys, characterized by their own microstructure.
[Display omitted]
•TCP coatings grown on 2024-T3 alloy were studied.•TCP coatings grown on a Cu-rich surface were less protective.•TCP coatings grown on a surface with great roughness were less protective.•A fast kinetics of TCP coating growth was detrimental for protective properties.•The influence of the batches for an alloy was seen in low-aggressive medium only. |
doi_str_mv | 10.1016/j.surfcoat.2018.03.046 |
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[Display omitted]
•TCP coatings grown on 2024-T3 alloy were studied.•TCP coatings grown on a Cu-rich surface were less protective.•TCP coatings grown on a surface with great roughness were less protective.•A fast kinetics of TCP coating growth was detrimental for protective properties.•The influence of the batches for an alloy was seen in low-aggressive medium only.</description><identifier>ISSN: 0257-8972</identifier><identifier>EISSN: 1879-3347</identifier><identifier>DOI: 10.1016/j.surfcoat.2018.03.046</identifier><language>eng</language><publisher>Lausanne: Elsevier B.V</publisher><subject>Aluminium alloy ; Aluminum alloys ; Aluminum base alloys ; Chemical and Process Engineering ; Chromium ; Conversion coating ; Copper ; Corrosion resistance ; Electrochemical impedance spectroscopy ; Engineering Sciences ; Industrial applications ; Materials ; Microstructure ; Properties (attributes) ; Protective coatings ; Protective properties ; Roughness ; Salt spray tests ; Sodium chloride ; Sodium sulfate ; Trivalent chromium ; Trivalent chromium coating</subject><ispartof>Surface & coatings technology, 2018-06, Vol.344, p.276-287</ispartof><rights>2018 Elsevier B.V.</rights><rights>Copyright Elsevier BV Jun 25, 2018</rights><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c422t-f31b157624dc7f6f27c7b16bf9ab9c8edb5db4d0dc3545816f4ea4991bd157133</citedby><cites>FETCH-LOGICAL-c422t-f31b157624dc7f6f27c7b16bf9ab9c8edb5db4d0dc3545816f4ea4991bd157133</cites><orcidid>0000-0002-8095-6170 ; 0000-0003-2183-0671</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.surfcoat.2018.03.046$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>230,314,780,784,885,3550,27924,27925,45995</link.rule.ids><backlink>$$Uhttps://hal.science/hal-01989083$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Verdalet-Guardiola, Xavier</creatorcontrib><creatorcontrib>Bonino, Jean-Pierre</creatorcontrib><creatorcontrib>Duluard, Sandrine</creatorcontrib><creatorcontrib>Fori, Benoit</creatorcontrib><creatorcontrib>Blanc, Christine</creatorcontrib><title>Influence of the alloy microstructure and surface state on the protective properties of trivalent chromium coatings grown on a 2024 aluminium alloy</title><title>Surface & coatings technology</title><description>The protective properties of trivalent chromium process (TCP) coatings grown on a 2024-T3 aluminium alloy were studied on the basis of electrochemical measurements performed both in sulphate and chloride solutions and neutral salt spray tests. The influence of the alloy microstructure and surface state was studied: two batches, each one characterized by its own coarse intermetallic particle distribution, and two surface states, i.e. laminated and polished, were considered. Results showed that in 0.1 M Na2SO4, the protective properties of the TCP coatings decreased when the roughness of the initial surface increased. Furthermore, improved protective properties were observed for a TCP coating grown on a surface containing a lower amount of Al-Cu-Mg IMCs in the initial microstructure. The most plausible explanation is that a fast kinetics of coating growth, either associated to strong initial roughness or a great surface copper coverage, was detrimental for the protective properties of the coatings. In more aggressive solutions, i.e. 0.5 M NaCl solution or for neutral salt spray tests, the differences are not significant. The findings are highly relevant for industrial applications: the results showed that variations in batches, for a same type of alloy, or in initial surface state should not be detrimental for the corrosion resistance of the TCP coated samples. However, the conversion process had to be adapted for different types of alloys, characterized by their own microstructure.
[Display omitted]
•TCP coatings grown on 2024-T3 alloy were studied.•TCP coatings grown on a Cu-rich surface were less protective.•TCP coatings grown on a surface with great roughness were less protective.•A fast kinetics of TCP coating growth was detrimental for protective properties.•The influence of the batches for an alloy was seen in low-aggressive medium only.</description><subject>Aluminium alloy</subject><subject>Aluminum alloys</subject><subject>Aluminum base alloys</subject><subject>Chemical and Process Engineering</subject><subject>Chromium</subject><subject>Conversion coating</subject><subject>Copper</subject><subject>Corrosion resistance</subject><subject>Electrochemical impedance spectroscopy</subject><subject>Engineering Sciences</subject><subject>Industrial applications</subject><subject>Materials</subject><subject>Microstructure</subject><subject>Properties (attributes)</subject><subject>Protective coatings</subject><subject>Protective properties</subject><subject>Roughness</subject><subject>Salt spray tests</subject><subject>Sodium chloride</subject><subject>Sodium sulfate</subject><subject>Trivalent chromium</subject><subject>Trivalent chromium coating</subject><issn>0257-8972</issn><issn>1879-3347</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNqFkcuKFDEYhYMo2I6-ggRcuagyt0oqO4dBnYEGN7oOqVym01QlbZJqmefwhU11q1tXCT_fOf_lAPAWox4jzD8c-7Jmb5KuPUF47BHtEePPwA6PQnaUMvEc7BAZRDdKQV6CV6UcEUJYSLYDvx6in1cXjYPJw3pwUM9zeoJLMDmVmldT19yK0cKti25cqbo2Ol7oU07VmRrOl-_J5RpcuVjlcNazixWaQ05LWBe4jRjiY4GPOf2Mm4OGBBHWWq5LiBtyaf4avPB6Lu7Nn_cGfP_86dvdfbf_-uXh7nbfGUZI7TzFEx4EJ8wa4bknwogJ88lLPUkzOjsNdmIWWUMHNoyYe-Y0kxJPtskwpTfg_dX3oGd1ymHR-UklHdT97V5tNYTlKNFIz7ix765s2_LH6kpVx7Tm2MZTBCM0ipFL3ih-pbbjlez8P1uM1BaWOqq_YaktLIWoamE14cer0LV9z8FlVUzYUrEht_Mqm8L_LH4DYV2jzQ</recordid><startdate>20180625</startdate><enddate>20180625</enddate><creator>Verdalet-Guardiola, Xavier</creator><creator>Bonino, Jean-Pierre</creator><creator>Duluard, Sandrine</creator><creator>Fori, Benoit</creator><creator>Blanc, Christine</creator><general>Elsevier B.V</general><general>Elsevier BV</general><general>Elsevier</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7QQ</scope><scope>7SR</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>1XC</scope><scope>VOOES</scope><orcidid>https://orcid.org/0000-0002-8095-6170</orcidid><orcidid>https://orcid.org/0000-0003-2183-0671</orcidid></search><sort><creationdate>20180625</creationdate><title>Influence of the alloy microstructure and surface state on the protective properties of trivalent chromium coatings grown on a 2024 aluminium alloy</title><author>Verdalet-Guardiola, Xavier ; Bonino, Jean-Pierre ; Duluard, Sandrine ; Fori, Benoit ; Blanc, Christine</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c422t-f31b157624dc7f6f27c7b16bf9ab9c8edb5db4d0dc3545816f4ea4991bd157133</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Aluminium alloy</topic><topic>Aluminum alloys</topic><topic>Aluminum base alloys</topic><topic>Chemical and Process Engineering</topic><topic>Chromium</topic><topic>Conversion coating</topic><topic>Copper</topic><topic>Corrosion resistance</topic><topic>Electrochemical impedance spectroscopy</topic><topic>Engineering Sciences</topic><topic>Industrial applications</topic><topic>Materials</topic><topic>Microstructure</topic><topic>Properties (attributes)</topic><topic>Protective coatings</topic><topic>Protective properties</topic><topic>Roughness</topic><topic>Salt spray tests</topic><topic>Sodium chloride</topic><topic>Sodium sulfate</topic><topic>Trivalent chromium</topic><topic>Trivalent chromium coating</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Verdalet-Guardiola, Xavier</creatorcontrib><creatorcontrib>Bonino, Jean-Pierre</creatorcontrib><creatorcontrib>Duluard, Sandrine</creatorcontrib><creatorcontrib>Fori, Benoit</creatorcontrib><creatorcontrib>Blanc, Christine</creatorcontrib><collection>CrossRef</collection><collection>Ceramic Abstracts</collection><collection>Engineered Materials Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Hyper Article en Ligne (HAL)</collection><collection>Hyper Article en Ligne (HAL) (Open Access)</collection><jtitle>Surface & coatings technology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Verdalet-Guardiola, Xavier</au><au>Bonino, Jean-Pierre</au><au>Duluard, Sandrine</au><au>Fori, Benoit</au><au>Blanc, Christine</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Influence of the alloy microstructure and surface state on the protective properties of trivalent chromium coatings grown on a 2024 aluminium alloy</atitle><jtitle>Surface & coatings technology</jtitle><date>2018-06-25</date><risdate>2018</risdate><volume>344</volume><spage>276</spage><epage>287</epage><pages>276-287</pages><issn>0257-8972</issn><eissn>1879-3347</eissn><abstract>The protective properties of trivalent chromium process (TCP) coatings grown on a 2024-T3 aluminium alloy were studied on the basis of electrochemical measurements performed both in sulphate and chloride solutions and neutral salt spray tests. The influence of the alloy microstructure and surface state was studied: two batches, each one characterized by its own coarse intermetallic particle distribution, and two surface states, i.e. laminated and polished, were considered. Results showed that in 0.1 M Na2SO4, the protective properties of the TCP coatings decreased when the roughness of the initial surface increased. Furthermore, improved protective properties were observed for a TCP coating grown on a surface containing a lower amount of Al-Cu-Mg IMCs in the initial microstructure. The most plausible explanation is that a fast kinetics of coating growth, either associated to strong initial roughness or a great surface copper coverage, was detrimental for the protective properties of the coatings. In more aggressive solutions, i.e. 0.5 M NaCl solution or for neutral salt spray tests, the differences are not significant. The findings are highly relevant for industrial applications: the results showed that variations in batches, for a same type of alloy, or in initial surface state should not be detrimental for the corrosion resistance of the TCP coated samples. However, the conversion process had to be adapted for different types of alloys, characterized by their own microstructure.
[Display omitted]
•TCP coatings grown on 2024-T3 alloy were studied.•TCP coatings grown on a Cu-rich surface were less protective.•TCP coatings grown on a surface with great roughness were less protective.•A fast kinetics of TCP coating growth was detrimental for protective properties.•The influence of the batches for an alloy was seen in low-aggressive medium only.</abstract><cop>Lausanne</cop><pub>Elsevier B.V</pub><doi>10.1016/j.surfcoat.2018.03.046</doi><tpages>12</tpages><orcidid>https://orcid.org/0000-0002-8095-6170</orcidid><orcidid>https://orcid.org/0000-0003-2183-0671</orcidid><oa>free_for_read</oa></addata></record> |
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subjects | Aluminium alloy Aluminum alloys Aluminum base alloys Chemical and Process Engineering Chromium Conversion coating Copper Corrosion resistance Electrochemical impedance spectroscopy Engineering Sciences Industrial applications Materials Microstructure Properties (attributes) Protective coatings Protective properties Roughness Salt spray tests Sodium chloride Sodium sulfate Trivalent chromium Trivalent chromium coating |
title | Influence of the alloy microstructure and surface state on the protective properties of trivalent chromium coatings grown on a 2024 aluminium alloy |
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