{"id":241887,"date":"2024-10-19T15:50:53","date_gmt":"2024-10-19T15:50:53","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-en-62321-7-12015\/"},"modified":"2024-10-25T10:41:36","modified_gmt":"2024-10-25T10:41:36","slug":"bs-en-62321-7-12015","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-en-62321-7-12015\/","title":{"rendered":"BS EN 62321-7-1:2015"},"content":{"rendered":"

This part of IEC 62321<\/span> <\/span> describes a boiling water extraction procedure intended to provide a qualitative determination of the presence of hexavalent chromium (Cr(VI)) in colourless and coloured corrosion-protection coatings on metallic samples.<\/p>\n

Due to its highly reactive nature, the concentration of Cr(VI) in a corrosion-protection coating can change drastically with time and storage conditions. Since storage conditions prior to sample submission are not often known or provided with the samples, this procedure determines the presence of Cr(VI) based on the levels detected in the coatings at the time of testing. For testing of freshly coated samples, a minimum waiting period of 5 days (after the coating process) is necessary to ensure the coatings have stabilized. This waiting period allows potential post-process oxidation of Cr(III) to Cr(VI) to occur prior to testing.<\/p>\n

The presence of Cr(VI) is determined by the mass of Cr(VI) per surface area of the coating, in \u00b5g\/cm 2<\/sup>. This approach is preferred since corrosion-protection coating weights are often difficult to measure accurately after production. From a coating technology perspective, the industry as a whole has transitioned to either using the non-Cr(VI) based chemistries \u2013 where little to no Cr(VI) should be present \u2013 or using the traditional Cr(VI) based chemistries \u2013 where significant levels of Cr(VI) are present and can be detected reliably. Given this industry shift, the presence or absence of Cr(VI) is often sufficient for compliance testing purposes.<\/p>\n

In this procedure, when Cr(VI) in a sample is detected below the 0,10 \u00b5g\/cm 2<\/sup> LOQ (limit of quantification), the sample is considered to be negative for Cr(VI). Since Cr(VI) may not be uniformly distributed in the coating even within the same sample batch, a \u201cgrey zone\u201d between 0,10 \u00b5g\/cm 2<\/sup> and 0,13 \u00b5g\/cm 2<\/sup> has been established as \u201cinconclusive\u201d to reduce inconsistent results due to unavoidable coating variations. In this case, additional testing may be necessary to confirm the presence of Cr(VI). When Cr(VI) is detected above 0,13 \u00b5g\/cm 2<\/sup>, the sample is considered to be positive for the presence of Cr(VI) in the coating layer.<\/p>\n

PDF Catalog<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
6<\/td>\nEnglish
CONTENTS <\/td>\n<\/tr>\n
7<\/td>\nFOREWORD <\/td>\n<\/tr>\n
9<\/td>\nINTRODUCTION <\/td>\n<\/tr>\n
10<\/td>\n1 Scope
2 Normative references <\/td>\n<\/tr>\n
11<\/td>\n3 Terms, definitions and abbreviations
3.1 Terms and definitions
3.2 Abbreviations
4 Reagents
4.1 General
4.2 Reagents
5 Apparatus
5.1 General
5.2 Apparatus <\/td>\n<\/tr>\n
12<\/td>\n6 Sampling
7 Boiling water extraction procedure <\/td>\n<\/tr>\n
13<\/td>\nFigures
Figure 1 \u2013 Screw body and screw head measurements <\/td>\n<\/tr>\n
15<\/td>\n8 Calibration
8.1 Permanent calibration instruments
8.2 Traditional calibration instruments
9 Calculation
Tables
Table 1 \u2013 Comparison to standard solution and interpretation of results <\/td>\n<\/tr>\n
16<\/td>\n10 Precision
11 Quality assurance and control
11.1 Colorimetric instrument performance verification
11.2 Limits of detection (LOD) and limits of quantification (LOQ) <\/td>\n<\/tr>\n
17<\/td>\n12 Test report
Table 2 \u2013 Student\u2019s t values used for calculation of method detection limit (LOD or MDL = t-statistic \u00d7 standard deviation (sn-1)) <\/td>\n<\/tr>\n
18<\/td>\nTable 3 \u2013 Reporting table <\/td>\n<\/tr>\n
19<\/td>\nTable 4 \u2013 Example of a completed reporting table <\/td>\n<\/tr>\n
20<\/td>\nAnnex A (informative) International inter-laboratory study on corrosion-protected coatings \u2013 Data overview
Figure A.1 \u2013 Concentration of chromium VI based on surface area for all samples <\/td>\n<\/tr>\n
21<\/td>\nFigure A.2 \u2013 Concentration of chromium VI based on surface area \u2013Expanded view between 0\u00a0\uf06dg\/cm2 to 1\u00a0\uf06dg\/cm2 <\/td>\n<\/tr>\n
22<\/td>\nBibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Determination of certain substances in electrotechnical products – Determination of the presence of hexavalent chromium (Cr(VI)) in colorless and colored corrosion-protected coatings on metals by the colorimetric method<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
BSI<\/b><\/a><\/td>\n2016<\/td>\n24<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":241894,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[183,2641],"product_tag":[],"class_list":{"0":"post-241887","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-13-020-01","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/241887","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/241894"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=241887"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=241887"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=241887"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}