成人动漫影音先锋_亚洲艳妇高潮精品啪啪_国产成人精品午夜福麻豆小说_欧美日韩午夜视频在线_内射少妇后入中出射子宫视频_惠民福利亚洲VA无码专区国产乱码_熟妇乱伦中文字幕_黄网站永久免费网址_东京热无码av网站_腿高H视频在线观看

Derusting and degreasing of low carbon steel The traditional derusting and degreasing process of low carbon steel is mainly based on the treatment agent of cyanide formula. The cyanide decomposes when the temperature reaches 50 ℃, so the temperature should not be too high during treatment, which will reduce the treatment efficiency. Moreover, such treatment agent has the disadvantages of high toxicity, strong pollution, extremely difficult operation and treatment. However, the use of sodium glucoheptylate formula increases the treatment temperature, and under the synergistic effect with caustic soda, The efficiency of metal surface treatment is greatly improved.
The sodium glucoheptylate produced by the above process can prevent the deposition of the electroplating solution and make the electroplating coating more compact and bright. Under the synergistic effect of sodium glucoheptylate and caustic soda, the existing paint on the steel surface can be effectively removed for repainting, and the effect of corrosion and scale inhibition can also be achieved.