Acid in rust contamination aging process, will continue to bring oil or other impurities, which suspended impurities can be removed by scraping fishing methods; when soluble iron exceeds a certain content, rust will not only effect the bath greatly reduced, and an excess of iron ions with the surface of the mixed phosphate residue tank, accelerated aging aluminum phosphate bath Stone Which pollution, seriously affecting the quality of the workpiece phosphate, iron ion content in general acid should be controlled at no more than 6% to 10% is appropriate. Bath must be replaced when more than control targets. Metallurgical Metallurgical factors factors include casting methods, processing methods and heat stress corrosion effects of aluminum gold Stone dealers found cathodic polarization increased susceptibility to stress corrosion of the aluminum alloy, friction stir welding stress corrosion sensitivity than welding Low generally believed by 3004 aluminum alloy 6061-T6 and appropriate treatment does not appear SCC. Different types of metallurgical factors changed four aluminum surface film of aluminum supply manufacturers, and result in different crystal structures and the internal organization of aluminum The change, which affects the electrochemical behavior and mechanical behavior of aluminum, resulting in stress corrosion sensitivity of different aluminum supply aluminum Stone |. Heshun Aluminum | Aluminum Stone provided by the Aluminum Co., Ltd. Jinan Heshun. Jinan Heshun Aluminum Co., Ltd. (www.jnhsly.com) (www.jnhsly.cn) Shandong Jinan, aluminum products leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer demand. Aluminum in Heshun leadership with the staff warmly welcome all inquiries negotiations to create a better future for aluminum rolls.