汽車車身耐腐蝕狀況受所處環(huán)境、使用材料、結(jié)構(gòu)設(shè)計(jì)、生產(chǎn)制造工藝和維修保養(yǎng)等因素影響。其中，生產(chǎn)制造工藝中的車身電泳涂裝防腐在國(guó)內(nèi)主機(jī)廠已被廣泛關(guān)注，且展開了同步工藝分析，但是鍍鋅板材料的使用率由于受成本約束卻仍相對(duì)滯后。對(duì)于汽車車身防腐工藝十分有必要建立一套行之有效的車身鍍鋅板設(shè)計(jì)數(shù)據(jù)庫(kù)，從而制定乘用車車身鍍鋅板使用規(guī)范，來(lái)有效提高產(chǎn)品的防腐性能，優(yōu)化防腐設(shè)計(jì)成本。

The corrosion resistance of automobile body is affected by the environment, use materials, structural design, manufacturing process and maintenance factors. Among them, the anticorrosion of the car body electrophoresis coating in the manufacturing process has been widely concerned in the domestic oEMS, and the synchronous process analysis has been carried out, but the utilization rate of galvanized sheet materials is still relatively lagging behind due to the cost constraints. For the automobile body anti-corrosion process, it is necessary to establish a set of effective body galvanized plate design database, so as to formulate the use specifications of passenger car body galvanized plate, to effectively improve the anti-corrosion performance of products and optimize the anti-corrosion design cost.

鍍鋅層的厚度是決定鋼基板耐腐蝕性的最重要因素之一，根據(jù)瑞典防腐研究表明，鍍鋅層在7～10mm厚時(shí)防腐蝕性能最為合理，也有國(guó)內(nèi)進(jìn)行的相關(guān)研究認(rèn)為，鍍層厚度大于60g/m2時(shí)具有較好的耐膜下腐蝕性能。同時(shí)，鍍鋅鋼板在實(shí)際使用中的耐蝕性，不但取決于鍍鋅鋼板本身，還決定于鍍鋅鋼板的加工工藝狀態(tài)和使用環(huán)境，這三個(gè)因素也可成為鍍鋅鋼板腐蝕三角形。

The thickness of the galvanizing layer is one of the most important factors to determine the corrosion resistance of the steel substrate. According to the Swedish anticorrosion study, the corrosion resistance of the galvanizing layer is the most reasonable at 7~10mm thick. There are also domestic studies that the coating thickness is greater than 60g / m2. At the same time, the corrosion resistance of galvanized steel plate in actual use not only depends on the galvanized steel plate itself, but also depends on the processing process state and use environment of galvanized steel plate. These three factors can also become the corrosion triangle of galvanized steel plate.

汽車整車腐蝕一般按照三類進(jìn)行分析：一是外觀腐蝕，主要是外觀面表面發(fā)生銹蝕，對(duì)外觀件定義一般是3年無(wú)銹蝕；二是內(nèi)側(cè)腐蝕，產(chǎn)品件孔隙或腔體表面發(fā)生腐蝕，嚴(yán)重時(shí)銹穿孔，一般定義為10年無(wú)穿孔；三是結(jié)構(gòu)腐蝕，重要功能件結(jié)構(gòu)腐蝕會(huì)導(dǎo)致功能失效，從而出現(xiàn)安全性問(wèn)題。上述三類腐蝕根據(jù)嚴(yán)重程度需要采用鍍鋅板。

Vehicle corrosion is generally analyzed according to three types: first, appearance corrosion, mainly corrosion on the appearance surface, the second part is internal corrosion, product pores or cavity surface corrosion, severe rust perforation, generally defined as no perforation in 10 years; third, structural corrosion, structural corrosion of important functional parts will lead to functional failure, resulting in safety problems. The above three types of corrosion shall adopt galvanized plate according to their severity.

隨著鍍鋅技術(shù)的發(fā)展和汽車防腐蝕性能要求的進(jìn)一步提升，鍍鋅鋼板在車身上的應(yīng)用越來(lái)廣泛，歐美汽車白車身鍍鋅鋼板的應(yīng)用比例高達(dá)90%。

With the development of galvanizing technology and the further improvement of the anti-corrosion performance requirements of automobiles, the application of galvanized steel plate in the car body is more and more extensive, and the application proportion of galvanized steel plate in white in Europe and America is as high as 90%.