日本无铬化处理热镀锌彩钢板的开发厂家

无铬化处理热镀锌彩钢板的生产厂家Superdyma是一种在锌中添加Al、Mg、Si的合金化（zn-11al3mg-0.2si）高耐蚀性的热镀锌钢板。近年来，由于环保意识的提高，首先在家电领域推广无铬产品，在建材产品方面，对无铬产品的要求也越来越高。根据日本国土交通省发布的公共建筑工程标准，2016年无铬可作为建材产品使用。在这种背景下，新日铁住金公司开发了多种适用于超动态的无铬后处理膜，以满足环保的新要求。

Superdyma is an alloying (zn-11al3mg-0.2si) hot-dip galvanized steel sheet with high corrosion resistance and alloying (zn-11al3mg-0.2si) by adding Al, Mg and Si to Zn. In recent years, due to the improvement of environmental protection awareness, first of all in the field of home appliances to promote chrome free products, in building materials products, the requirements of chromium free products are also increasing. According to the public building engineering standards issued by the Ministry of land and transportation of Japan, chromium free may be used as building material products in 2016. In this context, Nippon Steel Sumikin has developed a variety of chrome free post-treatment films suitable for superdyma to meet the new requirements of environmental protection.

1. Structure of chromium free post treated galvanized steel sheet
Superdyma s a kind of steel plate with special treatment layer attached on the alloyed coating. The coating structure is shown in Fig. 1. The special treatment layer is a treatment layer with corrosion inhibitor added to the special film with corrosion factor shielding function, so it has both corrosion factor shielding function and self-healing function, and can replace chromate film. According to the different service conditions of the coated steel plate, the inorganic / organic components and corrosion inhibitor components of the chrome free post-treatment coating were optimized, and two kinds of non chrome post-treatment coatings were developed: one was QN type skin film with the same corrosion resistance as the traditional chromate coating, and the main component was inorganic compounds; The other is qfk type film with excellent corrosion resistance and processability and mainly composed of organic compounds.
2. Test method for properties of chrome free aftertreatment film
Table 1 shows the condition of the steel plate used for the film performance test without chrome treatment. The original plate is superdyma (the coating amount is 90g / m2). The original plate is treated by QN and qfk without chromium respectively. The traditional chromate post-treatment steel plate is used as the contrast steel plate for test.
2.1 corrosion resistance
The end of the sample was sealed, and the corrosion test was carried out on the plane part of the sample by salt spray test (JISZ2371), and the corrosion resistance was evaluated according to the area of white rust. In addition, outdoor exposure test was conducted in gonggu island. The end and back of the sample were sealed, and the exposed corrosion test was carried out with the specimen facing south and inclining 45 degrees. The corrosion resistance was evaluated according to the area ratio of white rust.
2.2 lubrication
The dynamic friction coefficient is one of the indexes to judge the formability of steel plate. The dynamic friction coefficient of steel plate was measured by heidon-14 dynamic friction coefficient tester. The sliding piece is a stainless steel ball with a diameter of 10 mm and a load of 1.0 n. The sliding speed of steel ball is 150 mm / min, and the dynamic friction coefficient shall be determined according to the steel ball.
In addition, in order to evaluate the sliding property of the steel plate plane during die stamping, the dynamic friction coefficient in the steel plate drawing test was measured. The test steel plate was clamped with a plane die made of SKD11 and the contact area was 30mm × 25mm. The clamping force was 0.5kn. The sample is drawn at the speed of 200 mm / min, and the friction coefficient is determined according to the drawing process.
2.3 conductivity
The interlayer resistance and contact resistance (grounding) of the test materials were measured. The interlayer resistance was measured according to jisc2550, the test voltage was 0.5V, and the test pressure was 2n / mm2. The contact resistance measurement method is four probe method.